diff --git a/apps/desktop/src/window/DesktopWindow.ts b/apps/desktop/src/window/DesktopWindow.ts
index 6270f80a4a7e6..20b43f91e63af 100644
--- a/apps/desktop/src/window/DesktopWindow.ts
+++ b/apps/desktop/src/window/DesktopWindow.ts
@@ -131,7 +131,7 @@ function getIconOption(
 }
 
 function getInitialWindowBackgroundColor(shouldUseDarkColors: boolean): string {
-  return shouldUseDarkColors ? "#0a0a0a" : "#ffffff";
+  return shouldUseDarkColors ? "#000000" : "#ffffff";
 }
 
 type DisplayBounds = Pick<Electron.Rectangle, "x" | "y" | "width" | "height">;
diff --git a/apps/web/index.html b/apps/web/index.html
index 13518deb6e5d1..a7a5e7450b3de 100644
--- a/apps/web/index.html
+++ b/apps/web/index.html
@@ -6,14 +6,14 @@
       name="viewport"
       content="width=device-width, initial-scale=1.0, viewport-fit=cover, interactive-widget=resizes-content"
     />
-    <meta name="theme-color" content="#0a0a0a" />
+    <meta name="theme-color" content="#000000" />
     <link rel="icon" href="/favicon.ico" sizes="48x48" />
     <link rel="apple-touch-icon" href="/apple-touch-icon.png" />
     <link rel="manifest" href="/manifest.webmanifest" />
     <script>
       (() => {
         const LIGHT_BACKGROUND = "#ffffff";
-        const DARK_BACKGROUND = "#0a0a0a";
+        const DARK_BACKGROUND = "#000000";
         const CUSTOM_THEMES_STORAGE_KEY = "t3code:themes:v1";
         const THEME_FOLLOW_SYSTEM_STORAGE_KEY = "t3code:theme-follow-system";
         const THEME_APPEARANCE_MODE_STORAGE_KEY = "t3code:theme-appearance-mode";
@@ -25,7 +25,7 @@
             accent: "#4f46e5",
           },
           dark: {
-            background: "#0a0a0a",
+            background: "#000000",
             foreground: "#f5f5f5",
             accent: "#818cf8",
           },
@@ -403,7 +403,7 @@
       }
 
       html.dark body {
-        background: #0a0a0a;
+        background: #000000;
         color: #f5f5f5;
       }
 
@@ -462,7 +462,7 @@
 
       html.dark #boot-error {
         --boot-error-fg: #f5f5f5;
-        --boot-error-bg: #0a0a0a;
+        --boot-error-bg: #000000;
       }
 
       html[data-theme-selected="true"] #boot-error {
diff --git a/apps/web/src/appInit.tsx b/apps/web/src/appInit.tsx
index e33b11c55f42d..0d1855882df5e 100644
--- a/apps/web/src/appInit.tsx
+++ b/apps/web/src/appInit.tsx
@@ -62,9 +62,6 @@ function startClientAppearance(): void {
     if (previous?.chatWidth !== settings.chatWidth) {
       root.dataset.chatWidth = settings.chatWidth;
     }
-    if (previous?.redesignEnabled !== settings.redesignEnabled) {
-      root.toggleAttribute("data-redesign", settings.redesignEnabled);
-    }
     if (previous?.appearanceContrast !== settings.appearanceContrast) {
       applyAppearanceContrast(root, settings.appearanceContrast);
     }
diff --git a/apps/web/src/components/ChatView.tsx b/apps/web/src/components/ChatView.tsx
index 462728f093c24..5940e9c47713f 100644
--- a/apps/web/src/components/ChatView.tsx
+++ b/apps/web/src/components/ChatView.tsx
@@ -1861,7 +1861,6 @@ export default function ChatView(props: ChatViewProps) {
   const threadPanelInlineOpen = useRightPanelStore((state) =>
     selectThreadPanelOpen(state.threadPanelVisibilityByThreadKey, activeThreadRef, "inline"),
   );
-  const centerChatBesideDetails = useClientSettings((s) => s.redesignEnabled);
   // Selects only the mode, so canvas resizes rerender the chat view only when the
   // card switches presentation.
   const threadPanelPresentation = useStore(
@@ -1873,7 +1872,6 @@ export default function ChatView(props: ChatViewProps) {
         threadRef: activeThreadRef,
         preview: canvasPreview,
         detailsCardInlineOpen: threadPanelInlineOpen,
-        centerBesideDetails: centerChatBesideDetails,
       }).detailsCardMode,
   );
   const threadPanelOpen = useRightPanelStore((state) =>
diff --git a/apps/web/src/components/ComposerPromptEditorTiptap.tsx b/apps/web/src/components/ComposerPromptEditorTiptap.tsx
index f0a23d2ab4336..ba5b46252590d 100644
--- a/apps/web/src/components/ComposerPromptEditorTiptap.tsx
+++ b/apps/web/src/components/ComposerPromptEditorTiptap.tsx
@@ -1077,7 +1077,7 @@ function ComposerPromptEditorTiptapInner(
 
   const editorAttributes = {
     class: cn(
-      "composer-tiptap -m-1 block max-h-52 min-h-19.5 redesign:min-h-12 overflow-y-auto p-1 whitespace-pre-wrap wrap-break-word bg-transparent leading-relaxed text-foreground focus:outline-none",
+      "composer-tiptap -m-1 block max-h-52 min-h-12 overflow-y-auto p-1 whitespace-pre-wrap wrap-break-word bg-transparent leading-relaxed text-foreground focus:outline-none",
       className,
     ),
     "data-testid": "composer-editor",
diff --git a/apps/web/src/components/DiffPanel.tsx b/apps/web/src/components/DiffPanel.tsx
index a5034b798ef18..9ade0b59c2b60 100644
--- a/apps/web/src/components/DiffPanel.tsx
+++ b/apps/web/src/components/DiffPanel.tsx
@@ -40,7 +40,6 @@ import { useStableCallback } from "../hooks/useStableCallback";
 import {
   buildFileDiffContentVersion,
   buildFileDiffIdentityKey,
-  getDiffCollapseIconClassName,
   getDiffLineStat,
   getRenderablePatch,
   resolveDiffThemeName,
@@ -122,14 +121,12 @@ function DiffFileCollapseToggle({
   fileKey,
   collapsed,
   unavailable,
-  iconClassName,
   onToggle,
 }: {
   filePath: string;
   fileKey: string;
   collapsed: boolean;
   unavailable: boolean;
-  iconClassName: string;
   onToggle: (fileKey: string) => void;
 }) {
   return (
@@ -151,7 +148,7 @@ function DiffFileCollapseToggle({
         }
       >
         <MorphIcon
-          className={cn("size-4", iconClassName)}
+          className="size-4 text-muted-foreground/80"
           icon={collapsed ? ChevronRight : ChevronDown}
         />
       </TooltipTrigger>
@@ -706,9 +703,9 @@ export default function DiffPanel({
             <Tooltip>
               <TooltipTrigger
                 render={
-                  // Too narrow for both refs, the New design keeps the target readable and drops
-                  // the head, which is the thread's own branch.
-                  <span className="flex min-w-[min(3rem,calc(100%-2.75rem))] items-center gap-2 overflow-hidden redesign:@max-[20rem]/diff-refs:hidden" />
+                  // Too narrow for both refs, keep the target readable and drop the head, which
+                  // is the thread's own branch.
+                  <span className="flex min-w-[min(3rem,calc(100%-2.75rem))] items-center gap-2 overflow-hidden @max-[20rem]/diff-refs:hidden" />
                 }
               >
                 <span className="min-w-0 max-w-48 truncate">
@@ -722,9 +719,7 @@ export default function DiffPanel({
             </Tooltip>
             <Tooltip>
               <TooltipTrigger
-                render={
-                  <span aria-hidden className="hidden redesign:@max-[20rem]/diff-refs:inline" />
-                }
+                render={<span aria-hidden className="hidden @max-[20rem]/diff-refs:inline" />}
               >
                 vs
               </TooltipTrigger>
@@ -746,7 +741,7 @@ export default function DiffPanel({
             >
               <ComboboxTrigger
                 render={<Button variant="ghost-muted" size="xs" />}
-                className="min-w-9 max-w-48 shrink redesign:shrink-0"
+                className="min-w-9 max-w-48 shrink-0"
                 aria-label={`Change comparison target. Currently ${selectedGitSource.baseRef}`}
               >
                 <span className="min-w-0 truncate">{selectedGitSource.baseRef}</span>
@@ -1126,7 +1121,6 @@ export default function DiffPanel({
                           fileKey={fileKey}
                           collapsed={unavailable || collapsedDiffFileKeys.has(fileKey)}
                           unavailable={unavailable}
-                          iconClassName={getDiffCollapseIconClassName(fileDiff)}
                           onToggle={toggleDiffFileCollapsed}
                         />
                       );
diff --git a/apps/web/src/components/DiffWorkerPoolProvider.tsx b/apps/web/src/components/DiffWorkerPoolProvider.tsx
index a9e89b62d1567..e2384aaab952b 100644
--- a/apps/web/src/components/DiffWorkerPoolProvider.tsx
+++ b/apps/web/src/components/DiffWorkerPoolProvider.tsx
@@ -3,14 +3,13 @@ import { WorkerPoolManager } from "@pierre/diffs/worker";
 import DiffsWorker from "@pierre/diffs/worker/worker.js?worker";
 import * as Schema from "effect/Schema";
 import { useEffect, useState, useSyncExternalStore, type ReactNode } from "react";
-import { subscribeClientSettings } from "../hooks/useSettings";
 import { getRenderedAppearance, subscribeRenderedAppearance } from "../hooks/useTheme";
 import { resolveDiffThemeName } from "../lib/diffRendering";
 import { PREFERRED_HIGHLIGHTER } from "../lib/syntaxHighlighting";
 
 export class DiffWorkerError extends Schema.TaggedError<DiffWorkerError>()("DiffWorkerError", {
   operation: Schema.Literals(["create-worker", "get-render-options", "set-render-options"]),
-  themeName: Schema.Literals(["pierre-light", "pierre-dark", "t3-light"]),
+  themeName: Schema.Literals(["pierre-dark", "t3-light"]),
   cause: Schema.Defect(),
 }) {
   override get message(): string {
@@ -73,12 +72,7 @@ function createDiffWorkerPool(poolSize: number) {
   );
   return {
     pool,
-    unsubscribeTheme: (() => {
-      const apply = () => applyDiffWorkerTheme(pool);
-      // The New design picks the light syntax palette, so a settings change can switch it too.
-      const unsubscribes = [subscribeRenderedAppearance(apply), subscribeClientSettings(apply)];
-      return () => unsubscribes.forEach((unsubscribe) => unsubscribe());
-    })(),
+    unsubscribeTheme: subscribeRenderedAppearance(() => applyDiffWorkerTheme(pool)),
     consumers: 0,
     idleTimer: undefined,
   };
diff --git a/apps/web/src/components/GitActionsControl.tsx b/apps/web/src/components/GitActionsControl.tsx
index 9f6dcc4262658..61ff760c45bfa 100644
--- a/apps/web/src/components/GitActionsControl.tsx
+++ b/apps/web/src/components/GitActionsControl.tsx
@@ -122,7 +122,6 @@ import { getSourceControlPresentation, sourceControlIcon } from "~/sourceControl
 import { sourceControlClients } from "@t3tools/client-runtime/source-control-clients";
 import { formatDiffCount } from "@t3tools/client-runtime/diff-count";
 import { useOpenLink } from "~/browser/useOpenLink";
-import { useClientSettings } from "~/hooks/useSettings";
 
 interface GitActionsControlProps {
   presentation?: "toolbar" | "menu";
@@ -1149,10 +1148,8 @@ export default function GitActionsControl({
       ? (quickAction.hint ?? "This action is currently unavailable.")
       : null;
   const gitActionProgress = resolveGitActionProgressPresentation(vcsActionState);
-  const redesign = useClientSettings((s) => s.redesignEnabled);
   // A fresh draft or a thread with no turns hides commit, push, and diff rows until there is work.
   const quietEmptyDraft =
-    redesign &&
     isPanel &&
     (draftId !== undefined || activeServerThreadShell?.latestRun === null) &&
     gitActionProgress === null &&
diff --git a/apps/web/src/components/Sidebar.tsx b/apps/web/src/components/Sidebar.tsx
index 72f90e27a8e3a..99f42874066b2 100644
--- a/apps/web/src/components/Sidebar.tsx
+++ b/apps/web/src/components/Sidebar.tsx
@@ -3201,14 +3201,10 @@ export default function Sidebar({ routeReveal }: { routeReveal: SidebarRouteReve
                             olderSettledShelf.retry();
                             showMoreSettled();
                           }}
-                          className="flex h-9 w-full cursor-pointer items-center gap-2.5 rounded-md px-2.5 text-left text-sm text-sidebar-muted-foreground/55 hover:bg-sidebar-row-hover hover:text-sidebar-foreground disabled:cursor-default redesign:text-sidebar-muted-foreground"
+                          className="flex h-9 w-full cursor-pointer items-center gap-2.5 rounded-md px-2.5 text-left text-sm text-sidebar-muted-foreground hover:bg-sidebar-row-hover hover:text-sidebar-foreground disabled:cursor-default"
                         >
-                          {/* The New design keeps plus for "add" and uses a chevron to reveal more. */}
-                          <PlusIcon aria-hidden className="size-4 shrink-0 redesign:hidden" />
-                          <ChevronDownIcon
-                            aria-hidden
-                            className="hidden size-4 shrink-0 redesign:block"
-                          />
+                          {/* Plus means "add", so revealing more uses a chevron. */}
+                          <ChevronDownIcon aria-hidden className="size-4 shrink-0" />
                           {olderSettledShelf.loading
                             ? "Loading"
                             : olderSettledShelf.failed
diff --git a/apps/web/src/components/ThreadStatusIndicators.tsx b/apps/web/src/components/ThreadStatusIndicators.tsx
index 15fe062a960f9..78b2a247ba5e5 100644
--- a/apps/web/src/components/ThreadStatusIndicators.tsx
+++ b/apps/web/src/components/ThreadStatusIndicators.tsx
@@ -287,7 +287,7 @@ function PullRequestBadge({
           className={cn("contents font-normal text-xs tabular-nums", presentation.toneClassName)}
         >
           <presentation.Icon aria-hidden className="size-3 shrink-0" />
-          <span className="redesign:text-secondary-label">{presentation.text}</span>
+          <span className="text-secondary-label">{presentation.text}</span>
         </span>
       </TooltipTrigger>
       <TooltipPopup
diff --git a/apps/web/src/components/chat/ChatCanvas.tsx b/apps/web/src/components/chat/ChatCanvas.tsx
index a0be0a3b6766e..bdcff99e6c2c2 100644
--- a/apps/web/src/components/chat/ChatCanvas.tsx
+++ b/apps/web/src/components/chat/ChatCanvas.tsx
@@ -6,7 +6,6 @@ import { resolveChatCanvasModel, type ChatCanvasStore } from "./canvasStore";
 import { selectThreadPanelOpen, useRightPanelStore } from "../../rightPanelStore";
 import { observeResize } from "../../lib/observeResize";
 import type { ScopedThreadRef } from "@t3tools/contracts";
-import { useClientSettings } from "~/hooks/useSettings";
 
 export function ChatCanvas({
   store,
@@ -72,14 +71,12 @@ export function ChatCanvas({
       ? false
       : selectThreadPanelOpen(state.threadPanelVisibilityByThreadKey, threadRef, "inline"),
   );
-  const centerBesideDetails = useClientSettings((s) => s.redesignEnabled);
   const model = resolveChatCanvasModel({
     measurements,
     detailsCardMeasurement,
     threadRef,
     preview,
     detailsCardInlineOpen,
-    centerBesideDetails,
   });
   const context = {
     container: model.container,
diff --git a/apps/web/src/components/chat/ChatComposer.tsx b/apps/web/src/components/chat/ChatComposer.tsx
index d7b46eea0abc0..bf43aaa5b1832 100644
--- a/apps/web/src/components/chat/ChatComposer.tsx
+++ b/apps/web/src/components/chat/ChatComposer.tsx
@@ -3658,7 +3658,7 @@ export const ChatComposer = memo(function ChatComposer(props: ChatComposerProps)
                     className={cn(
                       showMobilePendingAnswerActions && "max-sm:pb-12",
                       isComposerResting &&
-                        "my-0 max-h-8 min-h-8 redesign:min-h-8 overflow-hidden py-0 whitespace-pre! leading-8",
+                        "my-0 max-h-8 min-h-8 overflow-hidden py-0 whitespace-pre! leading-8",
                     )}
                     placeholderClassName={cn(
                       isComposerResting &&
diff --git a/apps/web/src/components/chat/ComposerPrimaryActions.tsx b/apps/web/src/components/chat/ComposerPrimaryActions.tsx
index 51c233807d154..e2c2a95747c57 100644
--- a/apps/web/src/components/chat/ComposerPrimaryActions.tsx
+++ b/apps/web/src/components/chat/ComposerPrimaryActions.tsx
@@ -2,7 +2,7 @@ import { memo, type MouseEventHandler, type PointerEventHandler } from "react";
 import { CheckIcon, ChevronDownIcon, ChevronLeftIcon, Minimize2Icon, PlayIcon } from "lucide-react";
 import { CornerUpRight, ListPlus } from "lucide";
 import { MorphIcon } from "~/components/MorphIcon";
-import { useClientSettings, useEnvironmentIdentificationMode } from "~/hooks/useSettings";
+import { useEnvironmentIdentificationMode } from "~/hooks/useSettings";
 import { formatContextWindowTokens } from "~/lib/contextWindow";
 import { cn } from "~/lib/utils";
 import { useShortcutModifierState } from "../../shortcutModifierState";
@@ -113,7 +113,6 @@ export const ComposerPrimaryActions = memo(function ComposerPrimaryActions({
     ? { onPointerDown: preventPointerFocus }
     : undefined;
   const environmentIdentificationMode = useEnvironmentIdentificationMode();
-  const redesign = useClientSettings((s) => s.redesignEnabled);
   const shortcutModifiers = useShortcutModifierState();
   const isQueuing =
     !isEditingQueuedMessage &&
@@ -369,16 +368,7 @@ export const ComposerPrimaryActions = memo(function ComposerPrimaryActions({
           render={
             <button
               type="button"
-              className={
-                redesign
-                  ? "flex h-7 shrink-0 cursor-pointer items-center gap-1.5 rounded-(--control-radius) px-2 font-medium text-base text-foreground/80 tabular-nums outline-none hover:bg-accent hover:text-foreground focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-ring disabled:pointer-events-none disabled:opacity-64 sm:text-sm aria-pressed:bg-accent/60 aria-pressed:text-foreground [&_svg]:pointer-events-none [&_svg]:size-4 [&_svg]:text-muted-foreground"
-                  : cn(
-                      "flex h-9 shrink-0 cursor-pointer items-center gap-1.5 rounded-full border px-2.5 text-xs tabular-nums outline-none transition-colors focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-ring disabled:pointer-events-none disabled:opacity-64 sm:h-8 [&_svg]:pointer-events-none [&_svg]:size-3.5",
-                      keepFullHistory
-                        ? "border-border text-muted-foreground hover:text-foreground"
-                        : "border-warning/40 text-warning hover:bg-warning/8",
-                    )
-              }
+              className="flex h-7 shrink-0 cursor-pointer items-center gap-1.5 rounded-(--control-radius) px-2 font-medium text-base text-foreground/80 tabular-nums outline-none hover:bg-accent hover:text-foreground focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-ring disabled:pointer-events-none disabled:opacity-64 sm:text-sm aria-pressed:bg-accent/60 aria-pressed:text-foreground [&_svg]:pointer-events-none [&_svg]:size-4 [&_svg]:text-muted-foreground"
               {...pointerFocusProps}
               aria-pressed={!keepFullHistory}
               aria-label={`Compact ${compactTokens} tokens of history before sending`}
@@ -388,19 +378,8 @@ export const ComposerPrimaryActions = memo(function ComposerPrimaryActions({
           }
         >
           <Minimize2Icon aria-hidden="true" />
-          {/* The new design keeps the token count in the tooltip so the permission label keeps its room. */}
-          {redesign ? (
-            keepFullHistory ? (
-              "Keep full"
-            ) : (
-              "Compact next"
-            )
-          ) : (
-            <>
-              {keepFullHistory ? "Full" : "Compact"}
-              <span>{compactTokens}</span>
-            </>
-          )}
+          {/* The token count lives in the tooltip so the permission label keeps its room. */}
+          {keepFullHistory ? "Keep full" : "Compact next"}
         </TooltipTrigger>
         <TooltipPopup>
           <div>
diff --git a/apps/web/src/components/chat/ModelListRow.tsx b/apps/web/src/components/chat/ModelListRow.tsx
index ec72827c3ca90..5c35d78e3886a 100644
--- a/apps/web/src/components/chat/ModelListRow.tsx
+++ b/apps/web/src/components/chat/ModelListRow.tsx
@@ -29,7 +29,6 @@ export const ModelListRow = memo(function ModelListRow(props: {
   acpRegistryIconUrl?: string | undefined;
   isFavorite: boolean;
   isSelected: boolean;
-  showSelection?: boolean;
   showProvider: boolean;
   preferShortName?: boolean;
   useTriggerLabel?: boolean;
@@ -61,7 +60,7 @@ export const ModelListRow = memo(function ModelListRow(props: {
     >
       <div className="min-w-0 flex-1 text-left">
         <div className="flex min-w-0 items-center gap-2">
-          <div className="min-w-0 truncate text-xs font-medium leading-snug redesign:text-sm redesign:font-normal">
+          <div className="min-w-0 truncate text-sm font-normal leading-snug">
             {props.useTriggerLabel
               ? getTriggerDisplayModelLabel(model)
               : getDisplayModelName(
@@ -124,7 +123,7 @@ export const ModelListRow = memo(function ModelListRow(props: {
                     "size-3.5 sm:size-3",
                     props.isFavorite
                       ? "fill-current text-warning"
-                      : "redesign:opacity-0 redesign:group-hover:opacity-100 redesign:group-data-highlighted:opacity-100 redesign:in-focus-visible:opacity-100 redesign:pointer-coarse:opacity-100",
+                      : "opacity-0 group-hover:opacity-100 group-data-highlighted:opacity-100 in-focus-visible:opacity-100 pointer-coarse:opacity-100",
                   )}
                 />
               </Button>
@@ -135,12 +134,10 @@ export const ModelListRow = memo(function ModelListRow(props: {
           </TooltipPopup>
         </Tooltip>
         {/* Last, and always reserved, so stars and the check keep fixed columns. */}
-        {props.showSelection ? (
-          <CheckIcon
-            className={cn("size-3.5", !props.isSelected && "invisible")}
-            aria-hidden="true"
-          />
-        ) : null}
+        <CheckIcon
+          className={cn("size-3.5", !props.isSelected && "invisible")}
+          aria-hidden="true"
+        />
       </div>
     </ComboboxItem>
   );
diff --git a/apps/web/src/components/chat/ModelPickerContent.tsx b/apps/web/src/components/chat/ModelPickerContent.tsx
index efeacbd4b3cd5..6d62255650851 100644
--- a/apps/web/src/components/chat/ModelPickerContent.tsx
+++ b/apps/web/src/components/chat/ModelPickerContent.tsx
@@ -49,7 +49,6 @@ import {
   shortcutLabelForCommand,
 } from "../../keybindings";
 import {
-  useClientSettings,
   useEnvironmentModelPreferences,
   useToggleEnvironmentModelFavorite,
 } from "~/hooks/useSettings";
@@ -165,7 +164,7 @@ const EMPTY_MODEL_JUMP_LABELS = new Map<string, string>();
 const MODEL_LIST_ESTIMATED_ITEM_SIZE = 52;
 // Rendered heights in `--spacing` units. Chrome is the search box and list padding, plus a 1px border.
 const ONE_LINE_ROW_UNITS = 8;
-const TWO_LINE_ROW_UNITS = { classic: 11.25, redesign: 12 };
+const TWO_LINE_ROW_UNITS = 12;
 const ROW_SEPARATOR_UNITS = 0.5;
 const LIST_CHROME_UNITS = 15.5;
 
@@ -577,15 +576,12 @@ export const ModelPickerContent = memo(function ModelPickerContent(props: {
   const isLocked = lockedProvider !== null;
   const isSearching = searchQuery.trim().length > 0;
   // Inside one provider's tab the provider line repeats the selected rail icon on every row.
-  const redesign = useClientSettings((s) => s.redesignEnabled);
-  const rowsMixProviders = !redesign || isSearching || selectedInstanceId === "favorites";
+  const rowsMixProviders = isSearching || selectedInstanceId === "favorites";
   // Fit the tallest tab so switching tabs never resizes the popup and moves the rail under the cursor.
   const tallestTabUnits = (() => {
     const unitsByTab = new Map<ProviderInstanceId | "favorites", number>();
     const addRow = (tab: ProviderInstanceId | "favorites", twoLine: boolean) => {
-      const rowUnits = twoLine
-        ? TWO_LINE_ROW_UNITS[redesign ? "redesign" : "classic"]
-        : ONE_LINE_ROW_UNITS;
+      const rowUnits = twoLine ? TWO_LINE_ROW_UNITS : ONE_LINE_ROW_UNITS;
       const previous = unitsByTab.get(tab);
       unitsByTab.set(
         tab,
@@ -600,7 +596,7 @@ export const ModelPickerContent = memo(function ModelPickerContent(props: {
       if (model.isLegacy && !isFavorite) {
         tabsWithLegacyRow.add(model.instanceId);
       } else {
-        addRow(model.instanceId, !redesign || Boolean(model.subProvider));
+        addRow(model.instanceId, Boolean(model.subProvider));
       }
     }
     for (const instanceId of tabsWithLegacyRow) addRow(instanceId, true);
@@ -977,10 +973,8 @@ export const ModelPickerContent = memo(function ModelPickerContent(props: {
                       className="group w-full cursor-pointer"
                     >
                       <div className="min-w-0 flex-1 text-left">
-                        <div className="text-xs font-medium leading-snug redesign:text-sm redesign:font-normal">
-                          Legacy models
-                        </div>
-                        <div className="mt-1 text-xs font-normal leading-snug text-muted-foreground/70 redesign:text-muted-foreground">
+                        <div className="text-sm font-normal leading-snug">Legacy models</div>
+                        <div className="mt-1 text-xs font-normal leading-snug text-muted-foreground">
                           {legacySection.legacyModels.length} models
                         </div>
                       </div>
@@ -1019,7 +1013,6 @@ export const ModelPickerContent = memo(function ModelPickerContent(props: {
                         ? selectedModelKeySet.has(modelKey)
                         : modelKey === activeModelKey
                     }
-                    showSelection={selectedModelKeys !== undefined || redesign}
                     showProvider={rowsMixProviders || Boolean(model.subProvider)}
                     preferShortName={!isLocked}
                     useTriggerLabel={false}
diff --git a/apps/web/src/components/chat/ModelPickerSidebar.tsx b/apps/web/src/components/chat/ModelPickerSidebar.tsx
index 7e4b1b82c3d41..0dca95cf02b94 100644
--- a/apps/web/src/components/chat/ModelPickerSidebar.tsx
+++ b/apps/web/src/components/chat/ModelPickerSidebar.tsx
@@ -25,8 +25,6 @@ function describeUnavailableInstance(entry: ProviderInstanceEntry): string {
   return msg ? `${label}: ${kind}. ${msg}` : `${label}: ${kind}.`;
 }
 
-const SELECTED_INDICATOR_CLASS =
-  "pointer-events-none absolute -right-1 top-1/2 z-10 h-5 w-0.75 -translate-y-1/2 rounded-l-full bg-primary redesign:right-1 redesign:rounded-full";
 const BADGE_BASE_CLASS =
   "pointer-events-none absolute -right-0.5 top-0.5 z-10 flex size-3.5 items-center justify-center rounded-full bg-transparent shadow-sm ";
 const NEW_BADGE_CLASS = `${BADGE_BASE_CLASS} text-update-foreground `;
@@ -92,10 +90,7 @@ export const ModelPickerSidebar = memo(function ModelPickerSidebar(props: {
           {selectedIndicatorTop !== null ? (
             <div
               data-model-picker-selected-indicator="true"
-              className={cn(
-                SELECTED_INDICATOR_CLASS,
-                "right-0 translate-y-0 transition-[top] duration-200 ease-out",
-              )}
+              className="pointer-events-none absolute right-1 z-10 h-5 w-0.75 rounded-full bg-primary transition-[top] duration-200 ease-out"
               style={{ top: selectedIndicatorTop }}
             />
           ) : null}
diff --git a/apps/web/src/components/chat/ThreadDetailsControl.tsx b/apps/web/src/components/chat/ThreadDetailsControl.tsx
index cdfe3ea684b1f..e72e1cd7c46d7 100644
--- a/apps/web/src/components/chat/ThreadDetailsControl.tsx
+++ b/apps/web/src/components/chat/ThreadDetailsControl.tsx
@@ -53,22 +53,21 @@ export function ThreadDetailsControl({
           "relative inline-flex shrink-0 cursor-pointer items-center whitespace-nowrap border outline-none transition-[box-shadow,scale] [&:not([aria-haspopup]):not(:disabled):not([aria-disabled=true])]:will-change-[scale] [&:active:not([aria-haspopup])]:scale-[0.97] focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-ring focus-visible:ring-offset-1 focus-visible:ring-offset-background pointer-coarse:after:absolute pointer-coarse:after:size-full pointer-coarse:after:min-h-11 pointer-coarse:after:min-w-11 [&_svg]:pointer-events-none [&_svg:not([class*='size-'])]:size-4 disabled:pointer-events-none disabled:opacity-64 aria-disabled:cursor-not-allowed aria-disabled:opacity-64 [&_svg]:shrink-0",
           parts[part],
           multiline && "h-auto min-h-8 py-0.75 disabled:opacity-100 sm:h-auto",
-          tone === "muted" &&
-            "text-muted-foreground/70 hover:text-foreground/80 redesign:text-muted-foreground",
+          tone === "muted" && "text-muted-foreground hover:text-foreground/80",
           tone === "primary" &&
             // The row surface forces a faint hover fill with !important; the solid pill keeps its own.
-            "text-primary hover:text-primary redesign:bg-primary redesign:text-primary-foreground redesign:hover:text-primary-foreground redesign:hover:!bg-primary/85 redesign:data-pressed:!bg-primary/85 redesign:dark:hover:!bg-primary/85 redesign:dark:data-pressed:!bg-primary/85",
+            "bg-primary text-primary-foreground hover:text-primary-foreground hover:!bg-primary/85 data-pressed:!bg-primary/85 dark:hover:!bg-primary/85 dark:data-pressed:!bg-primary/85",
           tone === "destructive" &&
             "text-destructive hover:text-destructive data-pressed:text-destructive",
           // PR row actions share one 20px pill with a 1px inset focus ring that stays clear of the
           // label. The solid pill draws it in the canvas color so it shows against the fill.
           part === "meta" &&
             (tone === "primary" || tone === "destructive") &&
-            "redesign:h-5 redesign:focus-visible:ring-offset-0 redesign:focus-visible:ring-1",
-          part === "meta" && tone === "primary" && "redesign:focus-visible:ring-background",
+            "h-5 focus-visible:ring-1 focus-visible:ring-offset-0",
+          part === "meta" && tone === "primary" && "focus-visible:ring-background",
           part === "meta" &&
             tone === "destructive" &&
-            "redesign:bg-destructive/10 redesign:hover:!bg-destructive/16 redesign:data-pressed:!bg-destructive/16 redesign:dark:hover:!bg-destructive/16 redesign:dark:data-pressed:!bg-destructive/16",
+            "bg-destructive/10 hover:!bg-destructive/16 data-pressed:!bg-destructive/16 dark:hover:!bg-destructive/16 dark:data-pressed:!bg-destructive/16",
           className,
         ),
       },
diff --git a/apps/web/src/components/chat/ThreadDetailsPrRow.tsx b/apps/web/src/components/chat/ThreadDetailsPrRow.tsx
index 8fbf3a6cf7133..4014ee9d70030 100644
--- a/apps/web/src/components/chat/ThreadDetailsPrRow.tsx
+++ b/apps/web/src/components/chat/ThreadDetailsPrRow.tsx
@@ -439,7 +439,7 @@ export function ThreadDetailsPrRow({
       {detail !== null && (showChecks || trailingAction !== null || watching) ? (
         <div className="pb-1.5">
           {openRow(detail.title, "row", true)}
-          <div className="flex h-5 min-w-0 items-center gap-0.5 ps-9 pe-1 text-xs text-muted-foreground redesign:pe-2.5">
+          <div className="flex h-5 min-w-0 items-center gap-0.5 ps-9 pe-2.5 text-xs text-muted-foreground">
             <span className="me-1 shrink-0 tabular-nums">#{number}</span>
             {showChecks && checksRollup !== null ? (
               <PullRequestChecksPopover
diff --git a/apps/web/src/components/chat/ThreadDetailsPrRows.tsx b/apps/web/src/components/chat/ThreadDetailsPrRows.tsx
index da9ae531fe016..f954d275ac6fd 100644
--- a/apps/web/src/components/chat/ThreadDetailsPrRows.tsx
+++ b/apps/web/src/components/chat/ThreadDetailsPrRows.tsx
@@ -6,7 +6,7 @@ import {
   threadPullRequestKeyOf,
   visibleThreadPullRequests,
 } from "@t3tools/client-runtime/thread-pull-requests";
-import { ChevronDown, ChevronUp, Minus, Plus } from "lucide";
+import { ChevronDown, ChevronUp } from "lucide";
 import { useState, type ComponentProps, type MouseEvent as ReactMouseEvent } from "react";
 
 import { sourceControlClients } from "@t3tools/client-runtime/source-control-clients";
@@ -17,7 +17,6 @@ import { threadEnvironment } from "~/state/threads";
 import { useAtomCommand } from "~/state/use-atom-command";
 
 import { MorphIcon } from "~/components/MorphIcon";
-import { useClientSettings } from "~/hooks/useSettings";
 import { linkedPullRequestSnapshotStatus, prStatusIndicator } from "../ThreadStatusIndicators";
 
 import { ThreadDetailsPrRow } from "./ThreadDetailsPrRow";
@@ -76,8 +75,6 @@ export function ThreadDetailsPrRows({
   onOpenLink: (event: ReactMouseEvent<HTMLElement>, url: string) => void;
 }) {
   const [expanded, setExpanded] = useState(false);
-  // The plus already means "add" in this card (Add project script).
-  const redesign = useClientSettings((s) => s.redesignEnabled);
   const watch = useAtomCommand(threadEnvironment.watchPullRequest, { reportFailure: true });
   const stopWatching = (link: ThreadPullRequestLink | null) =>
     link?.watch === undefined
@@ -130,7 +127,8 @@ export function ThreadDetailsPrRows({
         <MorphIcon
           aria-hidden
           className="size-4 shrink-0"
-          icon={expanded ? (redesign ? ChevronUp : Minus) : redesign ? ChevronDown : Plus}
+          // Chevrons, not plus and minus: the plus already means "add" in this card.
+          icon={expanded ? ChevronUp : ChevronDown}
         />
         {expanded ? "Show less" : `Show ${rest.length} more`}
       </ThreadDetailsControl>
diff --git a/apps/web/src/components/chat/ThreadRelationshipsControl.tsx b/apps/web/src/components/chat/ThreadRelationshipsControl.tsx
index ff63be60d48e8..66fc6b6f21ec2 100644
--- a/apps/web/src/components/chat/ThreadRelationshipsControl.tsx
+++ b/apps/web/src/components/chat/ThreadRelationshipsControl.tsx
@@ -153,7 +153,7 @@ function ThreadLineageGroup(props: {
             className={cn(
               THREAD_DETAILS_PANEL_CHEVRON_CLASS,
               "transition-transform",
-              !expanded && "rotate-180 redesign:-rotate-90",
+              !expanded && "-rotate-90",
             )}
           />
         </ThreadDetailsControl>
diff --git a/apps/web/src/components/chat/ThreadStatusLine.tsx b/apps/web/src/components/chat/ThreadStatusLine.tsx
index 74a81f1bb623e..51ff851eb6971 100644
--- a/apps/web/src/components/chat/ThreadStatusLine.tsx
+++ b/apps/web/src/components/chat/ThreadStatusLine.tsx
@@ -1,6 +1,5 @@
 import type { ReactNode } from "react";
 
-import { useClientSettings } from "~/hooks/useSettings";
 import { InlineButton } from "../ui/button";
 
 export function ThreadStatusLine(props: {
@@ -12,8 +11,6 @@ export function ThreadStatusLine(props: {
   // Set for clock-dependent labels to trigger updates.
   readonly clockMinute?: string;
 }) {
-  // Muted, the action blends into the status text; the New design gives it full color.
-  const redesign = useClientSettings((s) => s.redesignEnabled);
   return (
     <div
       data-chat-thread-status-line="true"
@@ -22,11 +19,7 @@ export function ThreadStatusLine(props: {
       {props.icon}
       <span className="min-w-0 truncate">{props.label}</span>
       <span aria-hidden="true">·</span>
-      <InlineButton
-        tone={redesign ? "default" : "muted"}
-        disabled={props.actionDisabled}
-        onClick={props.onAction}
-      >
+      <InlineButton disabled={props.actionDisabled} onClick={props.onAction}>
         {props.actionLabel}
       </InlineButton>
     </div>
diff --git a/apps/web/src/components/chat/TraitsPicker.tsx b/apps/web/src/components/chat/TraitsPicker.tsx
index f6d099dfbb059..68580c39a1e3e 100644
--- a/apps/web/src/components/chat/TraitsPicker.tsx
+++ b/apps/web/src/components/chat/TraitsPicker.tsx
@@ -24,7 +24,7 @@ import {
   normalizeModelSlug,
 } from "@t3tools/shared/model";
 import { memo } from "react";
-import { BrainIcon, GaugeIcon } from "lucide-react";
+import { GaugeIcon } from "lucide-react";
 import {
   Menu,
   MenuGroup,
@@ -600,8 +600,7 @@ export const TraitsPicker = memo(function TraitsPicker({
                 size === "xs" ? "gap-1" : "gap-1.5",
               )}
             >
-              <ComposerControlIcon icon={BrainIcon} size={size} className="redesign:hidden" />
-              <ComposerControlIcon icon={GaugeIcon} size={size} className="hidden redesign:block" />
+              <ComposerControlIcon icon={GaugeIcon} size={size} />
               <span data-composer-control-label className="min-w-0 truncate">
                 {triggerLabel}
               </span>
@@ -609,8 +608,7 @@ export const TraitsPicker = memo(function TraitsPicker({
             </span>
           ) : (
             <>
-              <ComposerControlIcon icon={BrainIcon} size={size} className="redesign:hidden" />
-              <ComposerControlIcon icon={GaugeIcon} size={size} className="hidden redesign:block" />
+              <ComposerControlIcon icon={GaugeIcon} size={size} />
               <span data-composer-control-label>{triggerLabel}</span>
               <ComposerControlChevron size={size} />
             </>
diff --git a/apps/web/src/components/chat/canvasStore.test.ts b/apps/web/src/components/chat/canvasStore.test.ts
index 07222bc70a3cf..ad2fe38b044ba 100644
--- a/apps/web/src/components/chat/canvasStore.test.ts
+++ b/apps/web/src/components/chat/canvasStore.test.ts
@@ -38,7 +38,6 @@ describe("chat canvas model", () => {
         threadRef,
         preview: null,
         detailsCardInlineOpen: true,
-        centerBesideDetails: false,
       }).detailsCardMode;
     expect(resolve(1400)).toBe("inline");
     expect(resolve(900)).toBe("popover");
@@ -52,7 +51,6 @@ describe("chat canvas model", () => {
         threadRef,
         preview: { ...preview, position: { x: 760, y: 150 }, lastInteraction: "drag" },
         detailsCardInlineOpen: true,
-        centerBesideDetails: false,
       });
     const model = resolve(400);
     expect(model.layout.overlapsDetailsCard).toBe(true);
@@ -66,7 +64,6 @@ describe("chat canvas model", () => {
       threadRef,
       preview: { ...preview, position: { x: 760, y: 150 }, lastInteraction: "drag" },
       detailsCardInlineOpen: true,
-      centerBesideDetails: false,
     });
     expect(model.layout.overlapsDetailsCard).toBe(false);
     expect(model.detailsCardMode).toBe("inline");
diff --git a/apps/web/src/components/chat/canvasStore.ts b/apps/web/src/components/chat/canvasStore.ts
index 763b992f3d18f..76fb540dc5d41 100644
--- a/apps/web/src/components/chat/canvasStore.ts
+++ b/apps/web/src/components/chat/canvasStore.ts
@@ -85,7 +85,6 @@ export function resolveChatCanvasModel({
   threadRef,
   preview,
   detailsCardInlineOpen,
-  centerBesideDetails,
 }: {
   measurements: ChatCanvasMeasurements;
   detailsCardMeasurement: DetailsCardMeasurement | null;
@@ -93,7 +92,6 @@ export function resolveChatCanvasModel({
   threadRef: ScopedThreadRef | null;
   preview: ChatCanvasPreview | null;
   detailsCardInlineOpen: boolean;
-  centerBesideDetails: boolean;
 }) {
   const container = { width: measurements.width, height: measurements.height };
   const { findBar } = measurements;
@@ -138,7 +136,6 @@ export function resolveChatCanvasModel({
     composerHeight: measurements.composerHeight,
     detailsCard,
     findBar,
-    centerBesideDetails,
   });
   const detailsCardPlacement = resolveThreadDetailsCardLayout({
     container,
diff --git a/apps/web/src/components/chat/chatCanvasLayout.test.ts b/apps/web/src/components/chat/chatCanvasLayout.test.ts
index f5d7ae5681b23..10c0652f9011e 100644
--- a/apps/web/src/components/chat/chatCanvasLayout.test.ts
+++ b/apps/web/src/components/chat/chatCanvasLayout.test.ts
@@ -102,21 +102,17 @@ describe("chat canvas layout", () => {
     });
     expect(result.frame).toEqual({ x: 1260, y: 351, width: 240, height: 365 });
     expect(result.overlapsDetailsCard).toBe(false);
-    expect(result.chat).toEqual({ left: 424, width: 736, insetStart: 0, insetEnd: 0 });
+    expect(result.chat).toEqual({ left: 330, width: 736, insetStart: 0, insetEnd: 188 });
   });
-  it("centers the chat beside a details card it would crowd, when asked", () => {
-    const layout = (centerBesideDetails: boolean) =>
-      resolveChatCanvasLayout({
-        container: { width: 1344, height: 988 },
-        maxChatWidth: 736,
-        detailsCard: { left: 1052, right: 1332, bottom: 339 },
-        preview: null,
-        centerBesideDetails,
-      }).chat;
-    // Pushed left just enough to clear the card.
-    expect(layout(false).left).toBe(1052 - 32 - 736);
+  it("centers the chat beside a details card it would crowd", () => {
+    const { chat } = resolveChatCanvasLayout({
+      container: { width: 1344, height: 988 },
+      maxChatWidth: 736,
+      detailsCard: { left: 1052, right: 1332, bottom: 339 },
+      preview: null,
+    });
     // Equal space on both sides of the chat.
-    expect(layout(true)).toMatchObject({ left: (1052 - 736) / 2, width: 736 });
+    expect(chat).toMatchObject({ left: (1052 - 736) / 2, width: 736 });
   });
   it("keeps the chat canvas-centered when it clears the details card", () => {
     const result = resolveChatCanvasLayout({
@@ -124,7 +120,6 @@ describe("chat canvas layout", () => {
       maxChatWidth: 736,
       detailsCard: { left: 1876, right: 2188, bottom: 339 },
       preview: null,
-      centerBesideDetails: true,
     });
     expect(result.chat.left).toBe((2200 - 736) / 2);
   });
@@ -135,7 +130,6 @@ describe("chat canvas layout", () => {
         maxChatWidth: 736,
         detailsCard: { left: width - 292, right: width - 12, bottom: 339 },
         preview: null,
-        centerBesideDetails: true,
       }).chat.left;
     for (let width = 1300; width < 1800; width += 1) {
       expect(Math.abs(leftAt(width + 1) - leftAt(width))).toBeLessThanOrEqual(1);
@@ -261,7 +255,7 @@ describe("chat canvas layout", () => {
       const compact = layout(460);
       expect(compact.frame!.x + compact.frame!.width).toBe(1572);
       expect(compact.frame!.width).toBe(460);
-      expect(compact.chat.left).toBe(364);
+      expect(compact.chat.left).toBe(330);
       expect(compact.overlapsDetailsCard).toBe(true);
       expect(density(compact)).toBe("compact");
       expectClear(compact);
diff --git a/apps/web/src/components/chat/chatCanvasLayout.ts b/apps/web/src/components/chat/chatCanvasLayout.ts
index 73b2176ef903c..115dace32dfb2 100644
--- a/apps/web/src/components/chat/chatCanvasLayout.ts
+++ b/apps/web/src/components/chat/chatCanvasLayout.ts
@@ -30,7 +30,6 @@ export function resolveChatCanvasLayout({
   composerHeight = 0,
   detailsCard = null,
   findBar = null,
-  centerBesideDetails = false,
 }: {
   container: PreviewMiniPlayerSize;
   preview: ChatCanvasPreview | null;
@@ -40,8 +39,6 @@ export function resolveChatCanvasLayout({
   composerHeight?: number;
   detailsCard?: PreviewMiniPlayerObstacles["detailsCard"];
   findBar?: PreviewMiniPlayerObstacles["detailsCard"];
-  /** Center the chat in the space left of the details card when it would otherwise crowd it. */
-  centerBesideDetails?: boolean;
 }) {
   const centeredWidth = Math.max(0, Math.min(maxChatWidth, container.width - padding * 2));
   const laneRight = detailsCard
@@ -52,16 +49,15 @@ export function resolveChatCanvasLayout({
   // Beside a card it would crowd, the chat centers between the card and the canvas edge. The shift
   // eases to zero as clearance grows, so very wide windows keep the chat still and a resize
   // never jumps it.
-  const besideShift =
-    detailsCard && centerBesideDetails
-      ? Math.min(
-          (container.width - detailsCard.left) / 2,
-          Math.max(
-            0,
-            (container.width - detailsCard.left) / 2 - (laneRight - canvasCenterLeft - normalWidth),
-          ),
-        )
-      : 0;
+  const besideShift = detailsCard
+    ? Math.min(
+        (container.width - detailsCard.left) / 2,
+        Math.max(
+          0,
+          (container.width - detailsCard.left) / 2 - (laneRight - canvasCenterLeft - normalWidth),
+        ),
+      )
+    : 0;
   const normalLeft = Math.max(
     padding,
     Math.min(canvasCenterLeft - besideShift, laneRight - normalWidth),
diff --git a/apps/web/src/components/pullRequest/PullRequestGhosts.tsx b/apps/web/src/components/pullRequest/PullRequestGhosts.tsx
index b9192068294b6..c0f7b1959d9e0 100644
--- a/apps/web/src/components/pullRequest/PullRequestGhosts.tsx
+++ b/apps/web/src/components/pullRequest/PullRequestGhosts.tsx
@@ -54,9 +54,7 @@ export function PullRequestListGhost({ rows = 7, caption }: { rows?: number; cap
     <div role="status" aria-label={caption ?? "Loading pull requests"} className="space-y-0.5">
       {/* Outside the pulse so the explanation stays readable. */}
       {caption ? (
-        <p className="px-3 pb-1 text-xs font-medium text-muted-foreground/70 redesign:text-muted-foreground">
-          {caption}
-        </p>
+        <p className="px-3 pb-1 text-xs font-medium text-muted-foreground">{caption}</p>
       ) : null}
       <div className="motion-safe:animate-skeleton space-y-0.5">
         {Array.from({ length: rows }, (_, index) => (
diff --git a/apps/web/src/components/settings/AppearanceSettingsPanel.tsx b/apps/web/src/components/settings/AppearanceSettingsPanel.tsx
index fce3885d425de..e0877c8574acc 100644
--- a/apps/web/src/components/settings/AppearanceSettingsPanel.tsx
+++ b/apps/web/src/components/settings/AppearanceSettingsPanel.tsx
@@ -105,27 +105,6 @@ export function AppearanceSettingsPanel() {
       </SettingsSection>
 
       <SettingsSection id="appearance-interface" title="Interface">
-        <SettingsRow
-          {...searchableSetting("new-design")}
-          description="A true black dark mode, dimmer read threads, and simpler composer controls. Turn it off for the classic look."
-          resetAction={
-            settings.redesignEnabled !== DEFAULT_UNIFIED_SETTINGS.redesignEnabled ? (
-              <SettingResetButton
-                label="new design"
-                onClick={() =>
-                  updateSettings({ redesignEnabled: DEFAULT_UNIFIED_SETTINGS.redesignEnabled })
-                }
-              />
-            ) : null
-          }
-          control={
-            <Switch
-              checked={settings.redesignEnabled}
-              onCheckedChange={(checked) => updateSettings({ redesignEnabled: Boolean(checked) })}
-              aria-label="New design"
-            />
-          }
-        />
         <SettingsRow
           {...searchableSetting("setting-appearance-contrast")}
           description="Adjust the contrast of colors and borders across the interface."
diff --git a/apps/web/src/components/settings/ProviderInstanceCard.tsx b/apps/web/src/components/settings/ProviderInstanceCard.tsx
index d190007399f49..2fc3a6c2f5ce9 100644
--- a/apps/web/src/components/settings/ProviderInstanceCard.tsx
+++ b/apps/web/src/components/settings/ProviderInstanceCard.tsx
@@ -37,7 +37,6 @@ import {
 } from "@t3tools/shared/model";
 import { cn } from "../../lib/utils";
 import { useCopyToClipboard } from "../../hooks/useCopyToClipboard";
-import { useClientSettings } from "../../hooks/useSettings";
 import { useStableCallback } from "../../hooks/useStableCallback";
 import { normalizeProviderAccentColor } from "../../providerInstances";
 import { Badge } from "../ui/badge";
@@ -675,7 +674,6 @@ export function ProviderInstanceCard({
   const displayName =
     instance.displayName?.trim() || driverOption?.label || String(instance.driver);
   const accentColor = normalizeProviderAccentColor(instance.accentColor);
-  const redesign = useClientSettings((settings) => settings.redesignEnabled);
   const { copyToClipboard } = useCopyToClipboard<{ providerName: string }>({
     onCopy: ({ providerName }) => {
       toastManager.add({
@@ -968,7 +966,7 @@ export function ProviderInstanceCard({
         data-slot="settings-row"
         className={cn(
           "group flex min-h-18 items-center gap-3 px-3 py-3 transition-colors sm:px-4",
-          selected ? "bg-muted/45 redesign:bg-foreground/[0.06]" : "hover:bg-muted/25",
+          selected ? "bg-foreground/[0.06]" : "hover:bg-muted/25",
         )}
       >
         <div
@@ -1076,7 +1074,7 @@ export function ProviderInstanceCard({
     </div>
   );
 
-  // The New design gives provider status its own row instead of hanging it under the name field.
+  // Provider status gets its own row instead of hanging under the name field.
   const statusContent = (
     <>
       <ProviderStatusDiagnostic detail={statusDiagnostic}>
@@ -1136,10 +1134,9 @@ export function ProviderInstanceCard({
   return (
     <>
       <SettingsSection title={displayName} icon={titleIconNode} headerAction={editorHeaderAction}>
-        {redesign ? <SettingsRow title="Status" status={statusContent} /> : null}
+        <SettingsRow title="Status" status={statusContent} />
         <SettingsRow
           title="Display name"
-          {...(redesign ? {} : { status: statusContent })}
           control={
             <div
               inert={readOnly}
diff --git a/apps/web/src/components/settings/ProviderModelsSection.tsx b/apps/web/src/components/settings/ProviderModelsSection.tsx
index 8d9dde255c7ac..51d388913ef91 100644
--- a/apps/web/src/components/settings/ProviderModelsSection.tsx
+++ b/apps/web/src/components/settings/ProviderModelsSection.tsx
@@ -334,7 +334,7 @@ export function ProviderModelsSection({
             size="xs"
             variant="ghost-muted"
             // The ghost padding would inset the label from the column edge the toggles align to.
-            className="ml-auto redesign:-me-2"
+            className="-me-2 ml-auto"
             onClick={() => setIsAdding(true)}
           >
             <PlusIcon className="size-3" />
diff --git a/apps/web/src/components/settings/ProviderSettingsPanel.tsx b/apps/web/src/components/settings/ProviderSettingsPanel.tsx
index 327e345fffa90..d97ec725f54a9 100644
--- a/apps/web/src/components/settings/ProviderSettingsPanel.tsx
+++ b/apps/web/src/components/settings/ProviderSettingsPanel.tsx
@@ -1001,8 +1001,8 @@ export function EnvironmentProviderSettings({
           ) : null
         }
         headerAction={
-          // The ghost button's padding would inset its label; the New design aligns the text to the card edge.
-          <div className="flex min-w-0 items-center gap-2 redesign:-me-2">
+          // The ghost button's padding would inset its label, so pull the text to the card edge.
+          <div className="-me-2 flex min-w-0 items-center gap-2">
             <ProviderUpdatesAction />
             <Tooltip>
               <TooltipTrigger
@@ -1075,7 +1075,7 @@ export function EnvironmentProviderSettings({
             {selectedRow ? (
               <ScrollArea scrollFade chainVerticalScroll className="@min-[48rem]/providers:h-full">
                 {/* Flat sections run dividers edge to edge and inset text like the list beside them. */}
-                <div className="space-y-6 p-4 redesign:px-0">
+                <div className="space-y-6 py-4">
                   {renderProviderInstance(selectedRow, "editor")}
                 </div>
               </ScrollArea>
diff --git a/apps/web/src/components/settings/SettingsFontPreviews.tsx b/apps/web/src/components/settings/SettingsFontPreviews.tsx
index ceb5d15053d58..17efc7f1d77f1 100644
--- a/apps/web/src/components/settings/SettingsFontPreviews.tsx
+++ b/apps/web/src/components/settings/SettingsFontPreviews.tsx
@@ -43,7 +43,7 @@ export function PromptFontPreview() {
         skills={PREVIEW_SKILLS}
         disabled={false}
         placeholder={DEFAULT_COMPOSER_PLACEHOLDER}
-        className="max-h-42 min-h-14"
+        className="max-h-42"
         onChange={onChange}
         onPaste={noop}
       />
diff --git a/apps/web/src/components/settings/SettingsPanels.tsx b/apps/web/src/components/settings/SettingsPanels.tsx
index f8bb413849253..a9594cb0894e6 100644
--- a/apps/web/src/components/settings/SettingsPanels.tsx
+++ b/apps/web/src/components/settings/SettingsPanels.tsx
@@ -408,9 +408,6 @@ export function useSettingsRestore(onRestored?: () => void) {
     ...(settings.mathRenderingEnabled !== DEFAULT_UNIFIED_SETTINGS.mathRenderingEnabled
       ? ["Render math"]
       : []),
-    ...(settings.redesignEnabled !== DEFAULT_UNIFIED_SETTINGS.redesignEnabled
-      ? ["New design"]
-      : []),
     ...(settings.panelAnimationDurationMs !== DEFAULT_UNIFIED_SETTINGS.panelAnimationDurationMs
       ? ["Panel animations"]
       : []),
@@ -584,7 +581,6 @@ export function useSettingsRestore(onRestored?: () => void) {
       diffColorScheme: DEFAULT_UNIFIED_SETTINGS.diffColorScheme,
       chatWidth: DEFAULT_UNIFIED_SETTINGS.chatWidth,
       mathRenderingEnabled: DEFAULT_UNIFIED_SETTINGS.mathRenderingEnabled,
-      redesignEnabled: DEFAULT_UNIFIED_SETTINGS.redesignEnabled,
       timestampFormat: DEFAULT_UNIFIED_SETTINGS.timestampFormat,
       notificationMode: DEFAULT_UNIFIED_SETTINGS.notificationMode,
       inAppNotificationsEnabled: DEFAULT_UNIFIED_SETTINGS.inAppNotificationsEnabled,
diff --git a/apps/web/src/components/settings/ThemePreviewCircles.tsx b/apps/web/src/components/settings/ThemePreviewCircles.tsx
index 54f96c35b76a1..d8dab05079d78 100644
--- a/apps/web/src/components/settings/ThemePreviewCircles.tsx
+++ b/apps/web/src/components/settings/ThemePreviewCircles.tsx
@@ -172,7 +172,7 @@ export function ThemePreviewCircles({
                   aria-label={`Use ${label} ${mode} mode`}
                   aria-pressed={isPicked}
                   className={cn(
-                    "relative flex size-[68px] shrink-0 transform-gpu cursor-pointer items-center justify-center rounded-full p-1 outline-none redesign:p-1.5 transition-transform hover:scale-105 focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-ring focus-visible:ring-offset-2 focus-visible:ring-offset-card redesign:focus-visible:ring-0 redesign:focus-visible:ring-offset-0 redesign:focus-visible:outline-2 redesign:focus-visible:outline-solid redesign:focus-visible:-outline-offset-5 redesign:focus-visible:outline-foreground/60",
+                    "relative flex size-[68px] shrink-0 transform-gpu cursor-pointer items-center justify-center rounded-full p-1.5 outline-none transition-transform hover:scale-105 focus-visible:outline-2 focus-visible:outline-solid focus-visible:-outline-offset-5 focus-visible:outline-foreground/60",
                     isPicked && "hover:scale-100",
                   )}
                   onClick={(event) => {
diff --git a/apps/web/src/components/settings/ThemeSettings.tsx b/apps/web/src/components/settings/ThemeSettings.tsx
index e52589bb5efb6..17a6094b164fc 100644
--- a/apps/web/src/components/settings/ThemeSettings.tsx
+++ b/apps/web/src/components/settings/ThemeSettings.tsx
@@ -191,7 +191,7 @@ function ThemeLibraryCard({
                                 : `Use ${mode} variant, currently ${selected.option.label}`
                             }
                             aria-pressed={isActive}
-                            className="absolute left-1/2 top-2 z-20 flex size-14 items-center justify-center rounded-full outline-none focus-visible:outline-2 focus-visible:outline-solid focus-visible:-outline-offset-2 focus-visible:outline-ring redesign:focus-visible:-outline-offset-5 redesign:focus-visible:outline-foreground/60"
+                            className="absolute left-1/2 top-2 z-20 flex size-14 items-center justify-center rounded-full outline-none focus-visible:outline-2 focus-visible:outline-solid focus-visible:-outline-offset-5 focus-visible:outline-foreground/60"
                             style={{
                               transform: `translateX(calc(-50% + ${rootOffsetX}px))`,
                             }}
@@ -678,9 +678,9 @@ export function ThemeLibrary({
             aria-pressed={isActive}
             className={cn(
               // The accent ring marks the picked tile; focus is a neutral ring set inside it with a gap.
-              "flex cursor-pointer flex-col items-stretch gap-1.5 rounded-xl border p-2 outline-none transition-colors focus-visible:outline-2 focus-visible:outline-solid focus-visible:-outline-offset-2 focus-visible:outline-ring redesign:focus-visible:-outline-offset-7 redesign:focus-visible:outline-foreground/60",
+              "flex cursor-pointer flex-col items-stretch gap-1.5 rounded-xl border p-2 outline-none transition-colors focus-visible:outline-2 focus-visible:outline-solid focus-visible:-outline-offset-7 focus-visible:outline-foreground/60",
               isActive
-                ? "border-transparent bg-accent/30 ring-1 ring-inset ring-ring redesign:ring-2"
+                ? "border-transparent bg-accent/30 ring-2 ring-inset ring-ring"
                 : "border-border/70 bg-card/60 hover:bg-accent/10",
             )}
             key={mode}
@@ -827,12 +827,12 @@ export function ThemeLibrary({
 
   return (
     <div className="space-y-3">
-      <h3 className="flex min-h-7 items-center px-3 text-sm font-normal text-foreground/70 sm:px-4 redesign:text-base redesign:font-semibold redesign:text-foreground">
+      <h3 className="flex min-h-7 items-center px-3 text-base font-semibold text-foreground sm:px-4">
         {searchableSetting("color-scheme").title}
       </h3>
       {renderModeTiles()}
-      <div className="flex min-h-8 flex-wrap items-center justify-between gap-3 px-3 pt-2 sm:px-4 redesign:pt-5">
-        <h3 className="text-sm font-normal text-foreground/70 redesign:text-base redesign:font-semibold redesign:text-foreground">
+      <div className="flex min-h-8 flex-wrap items-center justify-between gap-3 px-3 pt-5 sm:px-4">
+        <h3 className="text-base font-semibold text-foreground">
           {searchableSetting("theme").title}
         </h3>
         <div className="flex flex-wrap items-center justify-end gap-2">
diff --git a/apps/web/src/components/settings/settingsSearch.ts b/apps/web/src/components/settings/settingsSearch.ts
index 1bd8f1bb08e19..5840566dc1ca1 100644
--- a/apps/web/src/components/settings/settingsSearch.ts
+++ b/apps/web/src/components/settings/settingsSearch.ts
@@ -403,12 +403,6 @@ export const SETTINGS_SEARCH_ITEMS = [
     to: "/settings/threads",
     searchTerms: ["usage quota rate limit reset recover continue"],
   },
-  {
-    id: "new-design",
-    title: "New design",
-    to: "/settings/appearance",
-    searchTerms: ["redesign look style sidebar composer black quieter classic"],
-  },
   {
     id: "working-shelf",
     title: "Working section",
diff --git a/apps/web/src/components/sidebar/SidebarListMarkers.tsx b/apps/web/src/components/sidebar/SidebarListMarkers.tsx
index 4c45b5829fb29..a8620a9ddf477 100644
--- a/apps/web/src/components/sidebar/SidebarListMarkers.tsx
+++ b/apps/web/src/components/sidebar/SidebarListMarkers.tsx
@@ -3,7 +3,6 @@ import { useSortable } from "@dnd-kit/sortable";
 import { CSS } from "@dnd-kit/utilities";
 import { type ReactNode } from "react";
 import { cn } from "~/lib/utils";
-import { useClientSettings } from "../../hooks/useSettings";
 import {
   animateSidebarLayoutChanges,
   sidebarMarkerId,
@@ -104,7 +103,7 @@ export function SidebarDragBoundary(props: {
 export function SidebarSectionHeader(props: {
   marker: "working-header" | "snoozed-header" | "settled-header";
   label: string;
-  /** A muted trailing count; classic shows it only while the shelf is collapsed. */
+  /** A muted trailing count. */
   count: number;
   className?: string;
   dragging?: boolean;
@@ -119,9 +118,6 @@ export function SidebarSectionHeader(props: {
       : props.marker === "snoozed-header"
         ? "snoozed"
         : "settled";
-  const redesign = useClientSettings((s) => s.redesignEnabled);
-  const collapsedCount = props.toggle.expanded ? null : props.count;
-  const count = redesign ? props.count : collapsedCount;
   return (
     <SortableSidebarMarker
       marker={props.marker}
@@ -136,14 +132,9 @@ export function SidebarSectionHeader(props: {
         expanded={props.toggle.expanded}
         tone={props.isDropTarget ? "accent" : props.dragging ? "emphasized" : "muted"}
         data-testid={`sidebar-${shelf}-shelf-toggle`}
-        accessory={
-          redesign && count !== null ? (
-            <span className="font-normal tabular-nums">{count}</span>
-          ) : null
-        }
+        accessory={<span className="font-normal tabular-nums">{props.count}</span>}
       >
         {props.label}
-        {!redesign && collapsedCount !== null ? ` (${collapsedCount})` : null}
       </CollapsibleSectionHeader>
     </SortableSidebarMarker>
   );
diff --git a/apps/web/src/components/sidebar/SidebarThreadHeader.tsx b/apps/web/src/components/sidebar/SidebarThreadHeader.tsx
index 1958277baa0c3..bccbd38f86a71 100644
--- a/apps/web/src/components/sidebar/SidebarThreadHeader.tsx
+++ b/apps/web/src/components/sidebar/SidebarThreadHeader.tsx
@@ -62,7 +62,7 @@ export function SidebarThreadHeader({
     <div className="flex items-center gap-1">
       <div
         ref={searchFieldRef}
-        className="flex h-8 min-w-0 flex-1 items-center gap-2 rounded-md px-2 py-1.5 text-sm font-medium text-sidebar-muted-foreground hover:bg-sidebar-row-hover hover:text-sidebar-foreground redesign:focus-within:bg-sidebar-row-hover redesign:focus-within:text-sidebar-foreground redesign:focus-within:ring-1 redesign:focus-within:ring-inset redesign:focus-within:ring-ring/70"
+        className="flex h-8 min-w-0 flex-1 items-center gap-2 rounded-md px-2 py-1.5 text-sm font-medium text-sidebar-muted-foreground hover:bg-sidebar-row-hover hover:text-sidebar-foreground focus-within:bg-sidebar-row-hover focus-within:text-sidebar-foreground focus-within:ring-1 focus-within:ring-inset focus-within:ring-ring/70"
       >
         <SearchIcon className="size-4 shrink-0 text-(--sidebar-icon-color)" />
         <SidebarInput
diff --git a/apps/web/src/components/sidebar/SidebarThreadRow.tsx b/apps/web/src/components/sidebar/SidebarThreadRow.tsx
index 8837d47ae0eec..449be6dff7aa8 100644
--- a/apps/web/src/components/sidebar/SidebarThreadRow.tsx
+++ b/apps/web/src/components/sidebar/SidebarThreadRow.tsx
@@ -912,9 +912,9 @@ const SidebarThreadRow = memo(function SidebarThreadRow(props: SidebarThreadRowP
     "group/sidebar-row relative w-full cursor-pointer overflow-hidden rounded-md text-left outline-none select-none focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-ring",
     variantAction === "unsettle" &&
       !props.isActive &&
-      "[&:not(:hover):not(:focus-within)_*]:text-secondary-label/70 redesign:[&:not(:hover):not(:focus-within)_*]:text-secondary-label",
+      "[&:not(:hover):not(:focus-within)_*]:text-secondary-label",
     props.isActive
-      ? "bg-sidebar-row-active text-sidebar-foreground light:shadow-xs light:ring-1 light:ring-inset light:ring-sidebar-border/70 redesign:light:shadow-none"
+      ? "bg-sidebar-row-active text-sidebar-foreground light:ring-1 light:ring-inset light:ring-sidebar-border/70"
       : isSelected || props.sweepAction !== null
         ? "bg-sidebar-row-selected text-sidebar-foreground light:ring-1 light:ring-inset light:ring-sidebar-border/70"
         : hasUnsentDraft
@@ -986,17 +986,15 @@ const SidebarThreadRow = memo(function SidebarThreadRow(props: SidebarThreadRowP
           ? cn(
               "truncate",
               shouldRecede
-                ? "text-secondary-label redesign:text-foreground/75 redesign:group-hover/sidebar-row:text-foreground redesign:group-focus-visible/sidebar-row:text-foreground"
-                : isUnread || isWoke || status === "input" || status === "request"
-                  ? "text-foreground"
-                  : status === "failed"
-                    ? "text-foreground/95"
-                    : "text-foreground/90 redesign:text-foreground",
+                ? "text-foreground/75 group-hover/sidebar-row:text-foreground group-focus-visible/sidebar-row:text-foreground"
+                : status === "failed" && !isUnread && !isWoke
+                  ? "text-foreground/95"
+                  : "text-foreground",
             )
           : cn(
               "truncate group-focus-within/sidebar-row:text-foreground group-hover/sidebar-row:text-foreground",
               shouldRecede
-                ? "text-secondary-label/70 redesign:text-secondary-label"
+                ? "text-secondary-label"
                 : props.isActive || isWoke || status === "input" || status === "request"
                   ? "text-foreground"
                   : isUnread
@@ -1140,8 +1138,6 @@ const SidebarThreadRow = memo(function SidebarThreadRow(props: SidebarThreadRowP
                 Regenerating title
               </span>
             ) : null}
-            {/* Shelf rows are one line; the New design gives the title the room a PR number takes. */}
-            {prBadge ? <span className="contents redesign:hidden">{prBadge}</span> : null}
             {sortable?.isDragging ? (
               dragDestination
             ) : (
@@ -1160,7 +1156,7 @@ const SidebarThreadRow = memo(function SidebarThreadRow(props: SidebarThreadRowP
                   {variantAction === "unsnooze" && props.snoozeWakeLabelText !== null ? (
                     <span className="inline-flex items-center gap-1 text-xs text-info-foreground tabular-nums">
                       {/* The clock tells a wake time from an age at a glance. */}
-                      <AlarmClockIcon aria-hidden className="hidden size-3 redesign:block" />
+                      <AlarmClockIcon aria-hidden className="size-3" />
                       {props.snoozeWakeLabelText}
                     </span>
                   ) : isWoke ? (
@@ -1253,7 +1249,7 @@ const SidebarThreadRow = memo(function SidebarThreadRow(props: SidebarThreadRowP
   }
 
   const diff = latestRunDiff(thread);
-  // Only the provider icon would remain; the New design drops the line instead of leaving it blank.
+  // Only the provider icon would remain, so the row drops the line instead of leaving it blank.
   const metaLineEmpty =
     !thread.branch &&
     !showsScratchMachine &&
@@ -1269,7 +1265,7 @@ const SidebarThreadRow = memo(function SidebarThreadRow(props: SidebarThreadRowP
       {...(fileDropHandlers ?? {})}
       className={cn(
         "list-none py-0.5 [content-visibility:auto] [contain-intrinsic-size:auto_78px]",
-        metaLineEmpty && "redesign:[contain-intrinsic-size:auto_58px]",
+        metaLineEmpty && "[contain-intrinsic-size:auto_58px]",
         sortable?.isDragging && "relative z-20",
       )}
     >
@@ -1296,7 +1292,7 @@ const SidebarThreadRow = memo(function SidebarThreadRow(props: SidebarThreadRowP
           <div
             className={cn(
               "relative z-10 h-[4.875rem] px-(--sidebar-row-content-inset) py-(--sidebar-content-inset)",
-              metaLineEmpty && "redesign:h-auto",
+              metaLineEmpty && "h-auto",
             )}
           >
             <div className="flex h-5 min-w-0 items-center gap-1.5">
@@ -1309,10 +1305,7 @@ const SidebarThreadRow = memo(function SidebarThreadRow(props: SidebarThreadRowP
               {pinIndicator}
               {props.projectDisplayName ? (
                 <span
-                  className={cn(
-                    "min-w-0 flex-1 truncate text-secondary-label text-xs",
-                    shouldRecede ? "font-normal" : "font-medium redesign:font-normal",
-                  )}
+                  className={cn("min-w-0 flex-1 truncate font-normal text-secondary-label text-xs")}
                 >
                   {props.projectDisplayName}
                 </span>
@@ -1466,7 +1459,7 @@ const SidebarThreadRow = memo(function SidebarThreadRow(props: SidebarThreadRowP
                 </span>
               ) : null}
               {metaLineEmpty ? (
-                <span aria-hidden className="hidden shrink-0 redesign:inline-flex">
+                <span aria-hidden className="inline-flex shrink-0">
                   <SidebarProviderStack
                     thread={thread}
                     providerEntryByInstanceId={props.providerEntryByInstanceId}
@@ -1474,64 +1467,59 @@ const SidebarThreadRow = memo(function SidebarThreadRow(props: SidebarThreadRowP
                 </span>
               ) : null}
             </div>
-            <div
-              className={cn(
-                "mt-0.5 flex min-w-0 items-center gap-1.5 text-secondary-label text-xs",
-                metaLineEmpty && "redesign:hidden",
-              )}
-            >
-              {thread.branch ? (
-                <>
-                  <ThreadWorktreeIndicator thread={thread} />
-                  <span className="flex min-w-0 flex-1 text-muted-foreground/40 redesign:text-inherit">
-                    <MiddleTruncate value={thread.branch} showTitle={false} />
-                  </span>
-                </>
-              ) : showsScratchMachine ? (
-                <>
-                  <EnvironmentMachineIcon
-                    aria-hidden
-                    kind={props.environmentMachine}
-                    className="size-3 shrink-0 text-muted-foreground/40 redesign:text-inherit"
-                  />
-                  <span className="min-w-0 flex-1 truncate text-muted-foreground/40 redesign:text-inherit">
-                    {props.scratchMachineLabel}
-                  </span>
-                </>
-              ) : (
-                <span className="flex-1" />
-              )}
-              {terminalStatusIcon}
-              {prBadge}
-              {diff ? (
-                <span className="shrink-0 font-mono">
-                  <span className="text-diff-addition-foreground">
-                    +{formatDiffCount(diff.insertions)}
-                  </span>{" "}
-                  <span className="text-diff-deletion-foreground">
-                    −{formatDiffCount(diff.deletions)}
-                  </span>
-                </span>
-              ) : null}
-              <span
-                aria-hidden
-                className="pointer-events-none ml-auto inline-flex shrink-0 items-center gap-1"
-              >
-                {isRemote && !showsScratchMachine ? (
-                  <span className="inline-flex shrink-0 items-center text-sidebar-muted-foreground/70">
+            {metaLineEmpty ? null : (
+              <div className="mt-0.5 flex min-w-0 items-center gap-1.5 text-secondary-label text-xs">
+                {thread.branch ? (
+                  <>
+                    <ThreadWorktreeIndicator thread={thread} />
+                    <span className="flex min-w-0 flex-1">
+                      <MiddleTruncate value={thread.branch} showTitle={false} />
+                    </span>
+                  </>
+                ) : showsScratchMachine ? (
+                  <>
                     <EnvironmentMachineIcon
                       aria-hidden
                       kind={props.environmentMachine}
-                      className="size-3.5"
+                      className="size-3 shrink-0"
                     />
+                    <span className="min-w-0 flex-1 truncate">{props.scratchMachineLabel}</span>
+                  </>
+                ) : (
+                  <span className="flex-1" />
+                )}
+                {terminalStatusIcon}
+                {prBadge}
+                {diff ? (
+                  <span className="shrink-0 font-mono">
+                    <span className="text-diff-addition-foreground">
+                      +{formatDiffCount(diff.insertions)}
+                    </span>{" "}
+                    <span className="text-diff-deletion-foreground">
+                      −{formatDiffCount(diff.deletions)}
+                    </span>
                   </span>
                 ) : null}
-                <SidebarProviderStack
-                  thread={thread}
-                  providerEntryByInstanceId={props.providerEntryByInstanceId}
-                />
-              </span>
-            </div>
+                <span
+                  aria-hidden
+                  className="pointer-events-none ml-auto inline-flex shrink-0 items-center gap-1"
+                >
+                  {isRemote && !showsScratchMachine ? (
+                    <span className="inline-flex shrink-0 items-center text-sidebar-muted-foreground/70">
+                      <EnvironmentMachineIcon
+                        aria-hidden
+                        kind={props.environmentMachine}
+                        className="size-3.5"
+                      />
+                    </span>
+                  ) : null}
+                  <SidebarProviderStack
+                    thread={thread}
+                    providerEntryByInstanceId={props.providerEntryByInstanceId}
+                  />
+                </span>
+              </div>
+            )}
           </div>
           {props.jumpLabel ? <JumpHintBadge label={props.jumpLabel} /> : null}
         </TooltipTrigger>
diff --git a/apps/web/src/components/ui/button.tsx b/apps/web/src/components/ui/button.tsx
index 5637baf28abbc..4dea8acd73e17 100644
--- a/apps/web/src/components/ui/button.tsx
+++ b/apps/web/src/components/ui/button.tsx
@@ -106,7 +106,7 @@ const inlineButtonVariants = cva(
         muted: "text-muted-foreground hover:text-foreground",
         destructive: "text-destructive/80 hover:text-destructive",
         picker:
-          "gap-1 text-foreground underline decoration-foreground/30 decoration-dotted decoration-from-font underline-offset-4 hover:decoration-foreground hover:decoration-solid data-popup-open:decoration-foreground data-popup-open:decoration-solid redesign:no-underline redesign:hover:underline redesign:data-popup-open:underline",
+          "gap-1 text-foreground decoration-from-font underline-offset-4 data-popup-open:underline",
       },
     },
   },
diff --git a/apps/web/src/components/ui/collapsible-section-header.tsx b/apps/web/src/components/ui/collapsible-section-header.tsx
index fc16fde42cfe8..94323b0ad9443 100644
--- a/apps/web/src/components/ui/collapsible-section-header.tsx
+++ b/apps/web/src/components/ui/collapsible-section-header.tsx
@@ -35,21 +35,13 @@ export function CollapsibleSectionHeader({
       <span className="shrink-0">{children}</span>
       <span
         aria-hidden
-        // A header with a trailing count drops its rule so it doesn't read as a leader. The New
-        // design drops it in both states so a shelf header looks the same open or closed.
-        className={cn(
-          "h-px min-w-2 flex-1",
-          tones[tone].line,
-          accessory && (expanded ? "redesign:invisible" : "invisible"),
-        )}
+        // A header with a trailing count drops its rule so it doesn't read as a leader.
+        className={cn("h-px min-w-2 flex-1", tones[tone].line, accessory && "invisible")}
       />
       {accessory}
       <ChevronDownIcon
         aria-hidden
-        className={cn(
-          "size-3 shrink-0 transition-transform",
-          !expanded && "rotate-180 redesign:-rotate-90",
-        )}
+        className={cn("size-3 shrink-0 transition-transform", !expanded && "-rotate-90")}
       />
     </button>
   );
diff --git a/apps/web/src/components/ui/combobox.tsx b/apps/web/src/components/ui/combobox.tsx
index ef3ce43eb40f6..21f8136811868 100644
--- a/apps/web/src/components/ui/combobox.tsx
+++ b/apps/web/src/components/ui/combobox.tsx
@@ -192,7 +192,7 @@ function ComboboxItem({
   return (
     <ComboboxPrimitive.Item
       className={cn(
-        "flex min-h-8 in-data-[side=none]:min-w-[calc(var(--anchor-width)+1.25rem)] cursor-pointer items-center rounded-sm px-2 py-1 text-base outline-none not-data-disabled:hover:bg-accent data-disabled:pointer-events-none data-disabled:cursor-not-allowed data-selected:bg-foreground/[0.08] data-selected:text-foreground data-highlighted:bg-accent data-highlighted:text-accent-foreground [&[data-highlighted][data-selected]]:bg-accent [&[data-highlighted][data-selected]]:text-accent-foreground redesign:data-selected:bg-foreground/[0.06] redesign:data-highlighted:bg-foreground/[0.09] redesign:[&[data-highlighted][data-selected]]:bg-foreground/[0.09] redesign:not-data-disabled:hover:bg-foreground/[0.09] data-disabled:opacity-64 sm:min-h-7 sm:text-sm [&_svg:not([class*='size-'])]:size-4.5 sm:[&_svg:not([class*='size-'])]:size-4 [&_svg]:pointer-events-none [&_svg]:shrink-0",
+        "flex min-h-8 in-data-[side=none]:min-w-[calc(var(--anchor-width)+1.25rem)] cursor-pointer items-center rounded-sm px-2 py-1 text-base outline-none not-data-disabled:hover:bg-foreground/[0.09] data-disabled:pointer-events-none data-disabled:cursor-not-allowed data-selected:bg-foreground/[0.06] data-selected:text-foreground data-highlighted:bg-foreground/[0.09] data-highlighted:text-accent-foreground [&[data-highlighted][data-selected]]:bg-foreground/[0.09] [&[data-highlighted][data-selected]]:text-accent-foreground data-disabled:opacity-64 sm:min-h-7 sm:text-sm [&_svg:not([class*='size-'])]:size-4.5 sm:[&_svg:not([class*='size-'])]:size-4 [&_svg]:pointer-events-none [&_svg]:shrink-0",
         className,
       )}
       data-slot="combobox-item"
diff --git a/apps/web/src/components/ui/command.tsx b/apps/web/src/components/ui/command.tsx
index 60daa212daed5..3beb9e266e79f 100644
--- a/apps/web/src/components/ui/command.tsx
+++ b/apps/web/src/components/ui/command.tsx
@@ -218,7 +218,7 @@ function CommandFooter({ className, ...props }: React.ComponentProps<"div">) {
   return (
     <div
       className={cn(
-        "relative flex items-center justify-between gap-2 rounded-b-[calc(var(--radius-2xl)-1px)] bg-foreground/[0.025] redesign:border-t redesign:border-foreground/[0.07] px-[var(--command-content-inset)] py-2.5 font-medium text-sm text-muted-foreground [&_[data-slot=kbd-group]]:font-sans [&_[data-slot=kbd]]:bg-foreground/[0.08] [&_[data-slot=kbd]]:text-foreground [&_[data-slot=kbd]]:ring-0",
+        "relative flex items-center justify-between gap-2 rounded-b-[calc(var(--radius-2xl)-1px)] border-t border-foreground/[0.07] bg-foreground/[0.025] px-[var(--command-content-inset)] py-2.5 font-medium text-sm text-muted-foreground [&_[data-slot=kbd-group]]:font-sans [&_[data-slot=kbd]]:bg-foreground/[0.08] [&_[data-slot=kbd]]:text-foreground [&_[data-slot=kbd]]:ring-0",
         className,
       )}
       data-slot="command-footer"
diff --git a/apps/web/src/components/ui/kbd.tsx b/apps/web/src/components/ui/kbd.tsx
index 849d7cf18b88a..7975b4dd14767 100644
--- a/apps/web/src/components/ui/kbd.tsx
+++ b/apps/web/src/components/ui/kbd.tsx
@@ -6,7 +6,7 @@ function Kbd({ className, ...props }: React.ComponentProps<"kbd">) {
   return (
     <kbd
       className={cn(
-        "pointer-events-none inline-flex h-5 min-w-5 select-none items-center justify-center gap-1 rounded bg-muted px-1 redesign:bg-foreground/[0.07] font-medium font-sans text-muted-foreground text-xs [&_svg:not([class*='size-'])]:size-3",
+        "pointer-events-none inline-flex h-5 min-w-5 select-none items-center justify-center gap-1 rounded bg-foreground/[0.07] px-1 font-medium font-sans text-muted-foreground text-xs [&_svg:not([class*='size-'])]:size-3",
         className,
       )}
       data-slot="kbd"
diff --git a/apps/web/src/components/usage/UsageLimitsPooled.tsx b/apps/web/src/components/usage/UsageLimitsPooled.tsx
index 0305b551edcbc..f195a4290ee5d 100644
--- a/apps/web/src/components/usage/UsageLimitsPooled.tsx
+++ b/apps/web/src/components/usage/UsageLimitsPooled.tsx
@@ -402,15 +402,12 @@ function SegmentTriggers({
               className="min-w-0 truncate font-medium text-foreground"
             />
           ) : null}
-          <span
-            className={cn(
-              "shrink-0 font-semibold text-foreground tabular-nums",
-              // A single-account bar repeats the headline percentage.
-              !showAccountName && "redesign:hidden",
-            )}
-          >
-            {remaining}%
-          </span>
+          {/* A single-account bar repeats the headline percentage. */}
+          {showAccountName ? (
+            <span className="shrink-0 font-semibold text-foreground tabular-nums">
+              {remaining}%
+            </span>
+          ) : null}
           {resetsIn || credits ? (
             <span className="ms-auto flex min-w-0 items-center gap-1.5 overflow-hidden rounded-sm bg-background/85 px-1.5 py-0.5 text-2xs whitespace-nowrap text-foreground tabular-nums">
               {resetsIn?.replace("resets in ", "↻ ") ?? ""}
diff --git a/apps/web/src/components/usage/UsagePage.tsx b/apps/web/src/components/usage/UsagePage.tsx
index b5c12b148fe80..a26daff189493 100644
--- a/apps/web/src/components/usage/UsagePage.tsx
+++ b/apps/web/src/components/usage/UsagePage.tsx
@@ -391,25 +391,25 @@ export function UsagePage() {
         </span>
       ) : null}
       <div className="ms-auto hidden shrink-0 items-center justify-end gap-2 @4xl/usage-header:flex">
-        <ToggleGroup
-          aria-label="Usage period"
-          variant="segmented"
-          value={[String(windowDays)]}
-          disabled={showingLimits}
-          // Limits are always current; the New design hides the period instead of greying it.
-          // It sits before the metric tabs so hiding it never moves them.
-          className={showingLimits ? "redesign:hidden" : undefined}
-          onValueChange={(next) => {
-            const value = next[0];
-            if (value) selectWindow(Number(value));
-          }}
-        >
-          {WINDOW_OPTIONS.map((option) => (
-            <Toggle key={option.days} value={String(option.days)} title={shortcutTitle(option)}>
-              {option.label}
-            </Toggle>
-          ))}
-        </ToggleGroup>
+        {/* Limits are always current, so they have no period. The period sits before the metric
+            tabs so dropping it never moves them. */}
+        {showingLimits ? null : (
+          <ToggleGroup
+            aria-label="Usage period"
+            variant="segmented"
+            value={[String(windowDays)]}
+            onValueChange={(next) => {
+              const value = next[0];
+              if (value) selectWindow(Number(value));
+            }}
+          >
+            {WINDOW_OPTIONS.map((option) => (
+              <Toggle key={option.days} value={String(option.days)} title={shortcutTitle(option)}>
+                {option.label}
+              </Toggle>
+            ))}
+          </ToggleGroup>
+        )}
         <ToggleGroup
           aria-label="Usage metric"
           variant="segmented"
@@ -437,33 +437,31 @@ export function UsagePage() {
         </Button>
       </div>
       <div className="ms-auto flex shrink-0 items-center justify-end gap-1 @4xl/usage-header:hidden">
-        <Select
-          value={String(windowDays)}
-          disabled={showingLimits}
-          onValueChange={(value) => selectWindow(Number(value))}
-        >
-          <SelectTrigger
-            aria-label="Usage period"
-            size="compact"
-            variant="ghost"
-            className={cn("w-auto min-w-0", showingLimits && "redesign:hidden")}
-          >
-            <SelectValue>
-              {WINDOW_OPTIONS.find((option) => option.days === windowDays)?.label}
-            </SelectValue>
-          </SelectTrigger>
-          <SelectPopup align="end" alignItemWithTrigger={false}>
-            {WINDOW_OPTIONS.map((option) => (
-              <SelectItem
-                key={option.days}
-                value={String(option.days)}
-                title={shortcutTitle(option)}
-              >
-                {option.label}
-              </SelectItem>
-            ))}
-          </SelectPopup>
-        </Select>
+        {showingLimits ? null : (
+          <Select value={String(windowDays)} onValueChange={(value) => selectWindow(Number(value))}>
+            <SelectTrigger
+              aria-label="Usage period"
+              size="compact"
+              variant="ghost"
+              className="w-auto min-w-0"
+            >
+              <SelectValue>
+                {WINDOW_OPTIONS.find((option) => option.days === windowDays)?.label}
+              </SelectValue>
+            </SelectTrigger>
+            <SelectPopup align="end" alignItemWithTrigger={false}>
+              {WINDOW_OPTIONS.map((option) => (
+                <SelectItem
+                  key={option.days}
+                  value={String(option.days)}
+                  title={shortcutTitle(option)}
+                >
+                  {option.label}
+                </SelectItem>
+              ))}
+            </SelectPopup>
+          </Select>
+        )}
         <Select
           value={metric}
           onValueChange={(value) => {
@@ -1338,7 +1336,7 @@ function UsageEnvironmentFilter({
             />
           ) : (
             <ChevronDownIcon
-              className="size-3.5 opacity-0 transition-opacity group-hover/usage-environment:opacity-100 group-focus-visible/usage-environment:opacity-100 group-data-popup-open/usage-environment:opacity-100 redesign:opacity-60 redesign:group-hover/usage-environment:opacity-100 redesign:group-focus-visible/usage-environment:opacity-100 redesign:group-data-popup-open/usage-environment:opacity-100"
+              className="size-3.5 opacity-60 transition-opacity group-hover/usage-environment:opacity-100 group-focus-visible/usage-environment:opacity-100 group-data-popup-open/usage-environment:opacity-100"
               aria-hidden
             />
           )}
@@ -1451,7 +1449,7 @@ function UsageProviderFilter({
       <MenuTrigger render={<InlineButton />} className="group/usage-provider min-w-0 max-w-full">
         <span className="min-w-0 truncate">{label}</span>
         <ChevronDownIcon
-          className="size-3.5 shrink-0 text-muted-foreground opacity-0 transition-opacity group-hover/usage-provider:opacity-100 group-focus-visible/usage-provider:opacity-100 group-data-popup-open/usage-provider:opacity-100 redesign:opacity-60 redesign:group-hover/usage-provider:opacity-100 redesign:group-focus-visible/usage-provider:opacity-100 redesign:group-data-popup-open/usage-provider:opacity-100"
+          className="size-3.5 shrink-0 text-muted-foreground opacity-60 transition-opacity group-hover/usage-provider:opacity-100 group-focus-visible/usage-provider:opacity-100 group-data-popup-open/usage-provider:opacity-100"
           aria-hidden
         />
       </MenuTrigger>
diff --git a/apps/web/src/index.css b/apps/web/src/index.css
index 30bc1c0268975..80c16a1b43159 100644
--- a/apps/web/src/index.css
+++ b/apps/web/src/index.css
@@ -4,9 +4,6 @@
 @custom-variant light (&:not(.dark, .dark *));
 /* Window Controls Overlay: active when Electron exposes native titlebar control geometry. */
 @custom-variant wco (&:is(.wco, .wco *));
-/* Beta "New design" (Settings -> Beta) sets data-redesign on <html>. The variant adds no
-   specificity, so it loses to dark:, hover: and other variants on the same property. */
-@custom-variant redesign (&:where([data-redesign] *));
 
 /* Secondary hovering pointers reveal sidebar actions on touch-primary devices. */
 @custom-variant any-hover {
@@ -1195,14 +1192,15 @@ html[data-mobile-composer-route-transition="true"]::view-transition-old(t3-mobil
 
   @variant dark {
     color-scheme: dark;
-    /* Keep controls and floating surfaces close to the neutral-black canvas.
-       Borders and hover states provide separation without milky gray fills. */
-    --background: var(--color-neutral-950);
-    --surface-raised: color-mix(in srgb, var(--background) 97%, var(--color-white));
+    /* The canvas is true black, matching the sidebar. Raised surfaces keep the tone they had
+       over neutral-950, so cards, popovers, and the composer still lift. Borders and hover
+       states provide separation without milky gray fills. */
+    --background: #000;
+    --surface-raised: color-mix(in srgb, var(--color-neutral-950) 97%, var(--color-white));
     --foreground: var(--color-neutral-100);
-    --card: color-mix(in srgb, var(--background) 97%, var(--color-white));
+    --card: color-mix(in srgb, var(--color-neutral-950) 97%, var(--color-white));
     --card-foreground: var(--color-neutral-100);
-    --popover: color-mix(in srgb, var(--background) 97%, var(--color-white));
+    --popover: color-mix(in srgb, var(--color-neutral-950) 97%, var(--color-white));
     --popover-foreground: var(--color-neutral-100);
     --primary: oklch(0.571 0.21 264);
     --secondary: --alpha(var(--color-white) / 3%);
@@ -1211,7 +1209,8 @@ html[data-mobile-composer-route-transition="true"]::view-transition-old(t3-mobil
     --muted-foreground: var(--color-neutral-400);
     --accent: --alpha(var(--color-white) / 4%);
     --accent-foreground: var(--color-neutral-100);
-    --message-surface: var(--accent);
+    /* A user turn sits above the composer tone, level with the selected sidebar row. */
+    --message-surface: color-mix(in srgb, var(--color-neutral-950) 92%, var(--color-white));
     --error: color-mix(in srgb, var(--color-red-500) 90%, var(--color-white));
     --error-foreground: var(--color-red-400);
     --tool-error-icon: #fca5a5;
@@ -1280,57 +1279,49 @@ html[data-mobile-composer-route-transition="true"]::view-transition-old(t3-mobil
     --sidebar-row-selected: color-mix(in srgb, var(--contrast-foreground) 7%, transparent);
     --sidebar-border: var(--border);
     --sidebar-stage-fade: var(--card);
+    /* Row metadata sits a step below read titles (75% white). */
+    --secondary-label: #8f8f8f;
   }
 }
 
-/* New design: modified files get a muted blue so added and deleted files lead. Built from the
-   info token, which themes do not override, so it stays blue in every theme. */
-html[data-redesign] {
+/* Modified files get a muted blue so added and deleted files lead. Built from the info token,
+   which themes do not override, so it stays blue in every theme. */
+:root {
   --diff-modified-icon: color-mix(in srgb, var(--info-foreground) 50%, var(--muted-foreground));
-}
 
-html.dark[data-redesign] {
-  /* On black a gray mix stays as bright as the blue, so dim with transparency instead. */
-  --diff-modified-icon: color-mix(in srgb, var(--info-foreground) 65%, transparent);
-  --diff-added-icon: var(--success-foreground);
+  @variant dark {
+    /* On black a gray mix stays as bright as the blue, so dim with transparency instead. */
+    --diff-modified-icon: color-mix(in srgb, var(--info-foreground) 65%, transparent);
+    --diff-added-icon: var(--success-foreground);
+  }
 }
 
-/* Blue-orange already spends blue on additions. */
-html[data-redesign][data-diff-color-scheme="blue-orange"] {
+/* Blue-orange already spends blue on additions. Same specificity as the dark block above and
+   later, so it wins there too. */
+:root[data-diff-color-scheme="blue-orange"] {
   --diff-modified-icon: var(--muted-foreground);
   --diff-added-icon: initial;
-}
 
-html.dark[data-redesign][data-diff-color-scheme="blue-orange"] {
-  --diff-modified-icon: color-mix(in srgb, var(--muted-foreground) 65%, transparent);
+  @variant dark {
+    --diff-modified-icon: color-mix(in srgb, var(--muted-foreground) 65%, transparent);
+  }
 }
 
-/* New design: sections in the provider detail pane sit flat in its card instead of nesting
-   cards inside it. Headings and row dividers still separate them. */
-[data-redesign] [data-provider-detail] [data-slot="settings-group"] {
+/* Sections in the provider detail pane sit flat in its card instead of nesting cards inside
+   it. Headings and row dividers still separate them. */
+[data-provider-detail] [data-slot="settings-group"] {
   border-color: transparent;
   background: transparent;
   box-shadow: none;
 }
 
-/* New design: a diff header's copy button shows on file hover or focus. */
+/* A diff header's copy button shows on file hover or focus. */
 @media (hover: hover) {
-  [data-redesign] diffs-container:not(:hover) [data-diff-copy-path]:not(:focus-within) {
+  diffs-container:not(:hover) [data-diff-copy-path]:not(:focus-within) {
     opacity: 0;
   }
 }
 
-/* New design: the default dark canvas is true black, matching the sidebar. Raised surfaces
-   keep the tone they had over neutral-950 so cards, popovers, and the composer still lift. */
-html.dark[data-redesign]:not([data-theme-id]) {
-  --background: #000;
-  --surface-raised: color-mix(in srgb, var(--color-neutral-950) 97%, var(--color-white));
-  --card: color-mix(in srgb, var(--color-neutral-950) 97%, var(--color-white));
-  --popover: color-mix(in srgb, var(--color-neutral-950) 97%, var(--color-white));
-  /* A user turn sits above the composer tone, level with the selected sidebar row. */
-  --message-surface: color-mix(in srgb, var(--color-neutral-950) 92%, var(--color-white));
-}
-
 /* Theme files are expressed in app color roles and mapped to the existing
    semantic surface tokens here. Keep this block after the sidebar-version
    compatibility overrides so both navigation implementations receive the
@@ -1735,13 +1726,6 @@ body {
   padding: 0;
 }
 
-/* New design: sidebar row metadata sits a step below read titles (75% white). */
-[data-redesign] [data-app-sidebar] {
-  @variant dark {
-    --secondary-label: #8f8f8f;
-  }
-}
-
 /* Lighter default icon stroke. In the base layer so stroke-* utilities still win; any
    CSS beats lucide's stroke-width="2" attribute. */
 @layer base {
@@ -2228,23 +2212,16 @@ code {
   border-collapse: collapse;
   overflow-wrap: normal;
   word-break: normal;
-  font-size: 0.75rem;
-}
-
-/* New design: tables sit one step under 15px prose instead of three. */
-[data-redesign] .chat-markdown table {
+  /* One step under 15px prose. */
   font-size: 0.875rem;
 }
 
-[data-redesign] .chat-markdown :is(td, th) {
-  text-wrap: pretty;
-}
-
 /* Top-aligned so wrapped rows share a first line, and the outer columns sit
    flush with the surrounding prose. */
 .chat-markdown th,
 .chat-markdown td {
   padding: 0.45rem 0.75rem;
+  text-wrap: pretty;
   text-align: start;
   vertical-align: top;
 }
diff --git a/apps/web/src/lib/diffRendering.ts b/apps/web/src/lib/diffRendering.ts
index cad519024869b..aac9b1f3e6366 100644
--- a/apps/web/src/lib/diffRendering.ts
+++ b/apps/web/src/lib/diffRendering.ts
@@ -3,20 +3,16 @@ import { parseDiffFromFile } from "@pierre/diffs";
 import type { FileDiffMetadata } from "@pierre/diffs/types";
 import { READABLE_LIGHT_THEME_NAME } from "./readableSyntaxTheme";
 
+// Light mode uses a darker pierre-light so syntax stays readable on every code surface.
 export const DIFF_THEME_NAMES = {
-  light: "pierre-light",
+  light: READABLE_LIGHT_THEME_NAME,
   dark: "pierre-dark",
-  readableLight: READABLE_LIGHT_THEME_NAME,
 } as const;
 
 export type DiffThemeName = (typeof DIFF_THEME_NAMES)[keyof typeof DIFF_THEME_NAMES];
 
 export function resolveDiffThemeName(theme: "light" | "dark"): DiffThemeName {
-  if (theme === "dark") return DIFF_THEME_NAMES.dark;
-  // The New design (data-redesign on <html>) keeps light syntax readable on every code surface.
-  return typeof document !== "undefined" && document.documentElement.hasAttribute("data-redesign")
-    ? DIFF_THEME_NAMES.readableLight
-    : DIFF_THEME_NAMES.light;
+  return DIFF_THEME_NAMES[theme];
 }
 
 const FNV_OFFSET_BASIS_32 = 0x811c9dc5;
@@ -278,21 +274,6 @@ export function buildFileDiffContentVersion(fileDiff: FileDiffMetadata): number
   return hash;
 }
 
-export function getDiffCollapseIconClassName(fileDiff: FileDiffMetadata): string {
-  switch (fileDiff.type) {
-    case "new":
-      return "text-[var(--diffs-addition-base)] redesign:text-muted-foreground/80";
-    case "deleted":
-      return "text-[var(--diffs-deletion-base)] redesign:text-muted-foreground/80";
-    case "change":
-    case "rename-pure":
-    case "rename-changed":
-      return "text-[var(--diffs-modified-base)] redesign:text-muted-foreground/80";
-    default:
-      return "text-muted-foreground/80";
-  }
-}
-
 export const DIFF_SURFACE_THEME_UNSAFE_CSS = `
 [data-diffs-header],
 [data-diff],
@@ -367,7 +348,7 @@ export const DIFF_SURFACE_THEME_UNSAFE_CSS = `
 [data-change-icon="deleted"] {
   color: light-dark(var(--diff-deletion-foreground), var(--diffs-deletion-base)) !important;
 }
-/* The page sets --diff-modified-icon under the New design: a muted T3 blue, so the common case stays quiet. */
+/* The page sets --diff-modified-icon to a muted T3 blue, so the common case stays quiet. */
 [data-change-icon="change"],
 [data-change-icon="rename-pure"],
 [data-change-icon="rename-changed"] {
diff --git a/apps/web/src/lib/incrementalHighlighting.ts b/apps/web/src/lib/incrementalHighlighting.ts
index 6f10798dfea6c..b1df31cb6ad28 100644
--- a/apps/web/src/lib/incrementalHighlighting.ts
+++ b/apps/web/src/lib/incrementalHighlighting.ts
@@ -1,12 +1,11 @@
 import {
   renderTokenLines,
   type DiffsHighlighter,
+  type DiffsThemeNames,
   type ThemedToken,
   type TokensResult,
 } from "@pierre/diffs";
 
-import type { DiffThemeName } from "./diffRendering";
-
 function highlightedDocument(
   result: TokensResult,
   lines = renderTokenLines(result.tokens, {}),
@@ -50,7 +49,7 @@ export function highlightCodeToHast(
   highlighter: DiffsHighlighter,
   code: string,
   language: string,
-  theme: DiffThemeName,
+  theme: DiffsThemeNames,
 ) {
   return highlightedDocument(highlighter.codeToTokens(code, { lang: language, theme }));
 }
@@ -58,7 +57,7 @@ export function highlightCodeToHast(
 export function createIncrementalHighlightedDocument(
   highlighter: DiffsHighlighter,
   language: string,
-  theme: DiffThemeName,
+  theme: DiffsThemeNames,
 ) {
   const options = { lang: language, theme };
   let shell: TokensResult | undefined;
diff --git a/apps/web/src/lib/syntaxHighlighting.ts b/apps/web/src/lib/syntaxHighlighting.ts
index a7e3833d1666d..9d1c8841054fc 100644
--- a/apps/web/src/lib/syntaxHighlighting.ts
+++ b/apps/web/src/lib/syntaxHighlighting.ts
@@ -21,7 +21,7 @@ export function getSyntaxHighlighterPromise(language: string): Promise<DiffsHigh
   if (cached) return cached;
 
   const promise = getSharedHighlighter({
-    // Every palette, so toggling the New design never needs a new highlighter.
+    // Both palettes, so switching appearance never needs a new highlighter.
     themes: Object.values(DIFF_THEME_NAMES),
     langs: [language as SupportedLanguages],
     preferredHighlighter: PREFERRED_HIGHLIGHTER,
diff --git a/packages/contracts/src/settings.ts b/packages/contracts/src/settings.ts
index 74acdb2a8dd48..649e0e0ab0ec5 100644
--- a/packages/contracts/src/settings.ts
+++ b/packages/contracts/src/settings.ts
@@ -473,8 +473,6 @@ export const ClientSettingsSchema = Schema.Struct({
   // Opt-in TeX typesetting in rendered Markdown. Off keeps math parsing and
   // KaTeX out of the render path entirely.
   mathRenderingEnabled: Schema.Boolean.pipe(Schema.withDecodingDefault(Effect.succeed(false))),
-  // The quieter sidebar, composer and panel design. Off keeps the classic look.
-  redesignEnabled: Schema.Boolean.pipe(Schema.withDecodingDefault(Effect.succeed(true))),
 });
 export type ClientSettings = typeof ClientSettingsSchema.Type;
 
@@ -1680,6 +1678,5 @@ export const ClientSettingsPatch = Schema.Struct({
   snapShotAnimations: Schema.optionalKey(Schema.Boolean),
   wordWrap: Schema.optionalKey(Schema.Boolean),
   mathRenderingEnabled: Schema.optionalKey(Schema.Boolean),
-  redesignEnabled: Schema.optionalKey(Schema.Boolean),
 });
 export type ClientSettingsPatch = typeof ClientSettingsPatch.Type;