feat(graph-ui): URL routing, filter panel UX, and camera fly-to fix

graph-ui/src/App.tsx

@@ -1,14 +1,62 @@
-import { useState } from "react";
+import { useCallback, useEffect, useState } from "react";
 import { GraphTab } from "./components/GraphTab";
 import { StatsTab } from "./components/StatsTab";
 import { ControlTab } from "./components/ControlTab";
 import type { TabId } from "./lib/types";
 import { useUiMessages } from "./lib/i18n";
 
+const TAB_IDS: TabId[] = ["graph", "stats", "control"];
+
+interface RouteState {
+  tab: TabId;
+  project: string | null;
+}
+
+/* Read the active tab + selected project from the URL query string so the
+ * current view survives refreshes and can be bookmarked or shared. */
+function readRoute(): RouteState {
+  const params = new URLSearchParams(window.location.search);
+  const rawTab = params.get("tab");
+  const tab = TAB_IDS.includes(rawTab as TabId) ? (rawTab as TabId) : "stats";
+  const project = params.get("project");
+  return { tab, project: project ? project : null };
+}
+
+/* Build the canonical URL for a route, preserving the path and hash. */
+function routeUrl(tab: TabId, project: string | null): string {
+  const params = new URLSearchParams();
+  params.set("tab", tab);
+  if (project) params.set("project", project);
+  return `${window.location.pathname}?${params.toString()}${window.location.hash}`;
+}
+
 export function App() {
   const t = useUiMessages();
-  const [activeTab, setActiveTab] = useState<TabId>("stats");
-  const [selectedProject, setSelectedProject] = useState<string | null>(null);
+  const [route, setRoute] = useState<RouteState>(readRoute);
+  const { tab: activeTab, project: selectedProject } = route;
+
+  /* Normalize the URL on first load so it always carries the current route. */
+  useEffect(() => {
+    const initial = readRoute();
+    window.history.replaceState(null, "", routeUrl(initial.tab, initial.project));
+  }, []);
+
+  /* Sync state when the user navigates with the browser back/forward buttons. */
+  useEffect(() => {
+    const onPopState = () => setRoute(readRoute());
+    window.addEventListener("popstate", onPopState);
+    return () => window.removeEventListener("popstate", onPopState);
+  }, []);
+
+  /* Change the route and push a history entry (skips no-op navigations). */
+  const navigate = useCallback((tab: TabId, project: string | null) => {
+    const url = routeUrl(tab, project);
+    const current = `${window.location.pathname}${window.location.search}${window.location.hash}`;
+    if (url === current) return;
+    window.history.pushState(null, "", url);
+    setRoute({ tab, project });
+  }, []);
+
   const tabs: { id: TabId; label: string }[] = [
     { id: "graph", label: t.tabs.graph },
     { id: "stats", label: t.tabs.projects },
@@ -29,19 +77,26 @@ export function App() {
 
           {/* Tabs inline in header */}
           <nav className="flex items-center gap-0.5">
-            {tabs.map((tab) => (
-              <button
-                key={tab.id}
-                onClick={() => setActiveTab(tab.id)}
-                className={`px-3 py-1 rounded-md text-[12px] font-medium transition-all ${
-                  activeTab === tab.id
-                    ? "bg-primary/15 text-primary"
-                    : "text-muted-foreground hover:text-foreground hover:bg-white/[0.04]"
-                }`}
-              >
-                {tab.label}
-              </button>
-            ))}
+            {tabs.map((tab) => {
+              const disabled = tab.id === "graph" && !selectedProject;
+              return (
+                <button
+                  key={tab.id}
+                  onClick={() => navigate(tab.id, tab.id === "stats" ? null : selectedProject)}
+                  disabled={disabled}
+                  title={disabled ? "Select a project first" : undefined}
+                  className={`px-3 py-1 rounded-md text-[12px] font-medium transition-all ${
+                    disabled
+                      ? "text-muted-foreground/30 cursor-not-allowed"
+                      : activeTab === tab.id
+                        ? "bg-primary/15 text-primary"
+                        : "text-muted-foreground hover:text-foreground hover:bg-white/[0.04]"
+                  }`}
+                >
+                  {tab.label}
+                </button>
+              );
+            })}
           </nav>
         </div>
 
@@ -54,7 +109,7 @@ export function App() {
               {selectedProject}
             </span>
             <button
-              onClick={() => { setSelectedProject(null); setActiveTab("stats"); }}
+              onClick={() => navigate("stats", null)}
               className="text-foreground/20 hover:text-foreground/50 text-[12px] ml-1 transition-colors"
             >
               ×
@@ -71,10 +126,7 @@ export function App() {
           <ControlTab />
         ) : (
           <StatsTab
-            onSelectProject={(p) => {
-              setSelectedProject(p);
-              setActiveTab("graph");
-            }}
+            onSelectProject={(p) => navigate("graph", p)}
           />
         )}
       </main>

graph-ui/src/components/FilterPanel.tsx

@@ -1,4 +1,5 @@
 import { useMemo } from "react";
+import { ScrollArea } from "@/components/ui/scroll-area";
 import { colorForLabel } from "../lib/colors";
 import type { GraphData } from "../lib/types";
 
@@ -37,9 +38,9 @@ export function FilterPanel({
   }, [data]);
 
   return (
-    <div className="px-4 py-3 border-b border-border/40 space-y-3">
-      {/* Header row */}
-      <div className="flex items-center justify-between">
+    <div className="flex flex-col shrink-0 max-h-[45%] border-b border-border/40">
+      {/* Header row — always visible */}
+      <div className="flex items-center justify-between px-4 pt-3 pb-2 shrink-0">
         <span className="text-[11px] font-medium text-foreground/50 uppercase tracking-widest">
           Filters
         </span>
@@ -50,66 +51,77 @@ export function FilterPanel({
         </div>
       </div>
 
-      {/* Node labels */}
-      <div>
-        <p className="text-[10px] text-foreground/30 mb-1.5">Nodes</p>
-        <div className="flex flex-wrap gap-1">
-          {labelCounts.map(([label, count]) => {
-            const on = enabledLabels.has(label);
-            const c = colorForLabel(label);
-            return (
-              <button
-                key={label}
-                onClick={() => onToggleLabel(label)}
-                className={`inline-flex items-center gap-1 px-1.5 py-[3px] rounded-md text-[10px] font-medium transition-all border ${
-                  on ? "border-white/[0.08] bg-white/[0.04]" : "border-transparent opacity-25"
-                }`}
-              >
-                <span className="w-[5px] h-[5px] rounded-full" style={{ backgroundColor: on ? c : "#444" }} />
-                <span style={{ color: on ? c : "#555" }}>{label}</span>
-                <span className="text-foreground/20 tabular-nums">{count.toLocaleString()}</span>
-              </button>
-            );
-          })}
-        </div>
-      </div>
+      {/* Scrollable filter groups */}
+      <ScrollArea className="flex-1 min-h-0">
+        <div className="px-4 pb-3 space-y-3">
+          {/* Node types */}
+          {labelCounts.length > 0 && (
+            <div>
+              <p className="text-[10px] font-medium text-foreground/40 mb-1.5 uppercase tracking-wider">Node types</p>
+              <div className="flex flex-wrap gap-1">
+                {labelCounts.map(([label, count]) => {
+                  const on = enabledLabels.has(label);
+                  const c = colorForLabel(label);
+                  return (
+                    <button
+                      key={label}
+                      onClick={() => onToggleLabel(label)}
+                      className={`inline-flex items-center gap-1 px-1.5 py-[3px] rounded-md text-[10px] font-medium transition-all border ${
+                        on ? "border-white/[0.08] bg-white/[0.04]" : "border-transparent opacity-25"
+                      }`}
+                    >
+                      <span className="w-[5px] h-[5px] rounded-full" style={{ backgroundColor: on ? c : "#444" }} />
+                      <span style={{ color: on ? c : "#555" }}>{label}</span>
+                      <span className="text-foreground/20 tabular-nums">{count.toLocaleString()}</span>
+                    </button>
+                  );
+                })}
+              </div>
+            </div>
+          )}
 
-      {/* Edge types */}
-      <div>
-        <p className="text-[10px] text-foreground/30 mb-1.5">Edges</p>
-        <div className="flex flex-wrap gap-1">
-          {edgeTypeCounts.map(([type, count]) => {
-            const on = enabledEdgeTypes.has(type);
-            return (
-              <button
-                key={type}
-                onClick={() => onToggleEdgeType(type)}
-                className={`inline-flex items-center gap-1 px-1.5 py-[3px] rounded-md text-[10px] font-medium transition-all border ${
-                  on ? "border-white/[0.06] bg-white/[0.03] text-foreground/60" : "border-transparent opacity-20 text-foreground/30"
-                }`}
-              >
-                {type.replace(/_/g, " ").toLowerCase()}
-                <span className="text-foreground/15 tabular-nums">{count.toLocaleString()}</span>
-              </button>
-            );
-          })}
+          {/* Relationships */}
+          {edgeTypeCounts.length > 0 && (
+            <div>
+              <p className="text-[10px] font-medium text-foreground/40 mb-1.5 uppercase tracking-wider">Relationships</p>
+              <div className="flex flex-wrap gap-1">
+                {edgeTypeCounts.map(([type, count]) => {
+                  const on = enabledEdgeTypes.has(type);
+                  return (
+                    <button
+                      key={type}
+                      onClick={() => onToggleEdgeType(type)}
+                      className={`inline-flex items-center gap-1 px-1.5 py-[3px] rounded-md text-[10px] font-medium transition-all border ${
+                        on ? "border-white/[0.06] bg-white/[0.03] text-foreground/60" : "border-transparent opacity-20 text-foreground/30"
+                      }`}
+                    >
+                      {type.replace(/_/g, " ").toLowerCase()}
+                      <span className="text-foreground/15 tabular-nums">{count.toLocaleString()}</span>
+                    </button>
+                  );
+                })}
+              </div>
+            </div>
+          )}
         </div>
-      </div>
+      </ScrollArea>
 
-      {/* Show labels toggle */}
-      <button
-        onClick={onToggleShowLabels}
-        className={`inline-flex items-center gap-1.5 text-[11px] font-medium transition-all ${
-          showLabels ? "text-primary" : "text-foreground/30"
-        }`}
-      >
-        <span className={`w-3.5 h-3.5 rounded border flex items-center justify-center transition-all ${
-          showLabels ? "border-primary bg-primary/20" : "border-foreground/15"
-        }`}>
-          {showLabels && <span className="text-primary text-[9px]">✓</span>}
-        </span>
-        Show labels
-      </button>
+      {/* Display options — pinned footer */}
+      <div className="px-4 py-2.5 border-t border-border/20 shrink-0">
+        <button
+          onClick={onToggleShowLabels}
+          className={`inline-flex items-center gap-1.5 text-[11px] font-medium transition-all ${
+            showLabels ? "text-primary" : "text-foreground/30"
+          }`}
+        >
+          <span className={`w-3.5 h-3.5 rounded border flex items-center justify-center transition-all ${
+            showLabels ? "border-primary bg-primary/20" : "border-foreground/15"
+          }`}>
+            {showLabels && <span className="text-primary text-[9px]">✓</span>}
+          </span>
+          Show labels
+        </button>
+      </div>
     </div>
   );
 }

graph-ui/src/components/GraphScene.tsx

@@ -17,7 +17,13 @@ interface CameraTarget {
   lookAt: THREE.Vector3;
 }
 
-function CameraAnimator({ target }: { target: CameraTarget | null }) {
+function CameraAnimator({
+  target,
+  controlsRef,
+}: {
+  target: CameraTarget | null;
+  controlsRef: React.RefObject<OrbitControlsImpl | null>;
+}) {
   const { camera } = useThree();
   const targetRef = useRef<CameraTarget | null>(null);
   const progress = useRef(1);
@@ -36,7 +42,17 @@ function CameraAnimator({ target }: { target: CameraTarget | null }) {
     const t = 1 - Math.pow(1 - progress.current, 3); /* ease-out cubic */
 
     camera.position.lerp(targetRef.current.position, t * 0.08);
-    camera.lookAt(targetRef.current.lookAt);
+
+    /* Move the OrbitControls pivot to the focus point as well. Otherwise the
+     * controls keep their target at the origin and re-center the view on the
+     * next frame, snapping the camera back to the middle after the fly-to. */
+    const controls = controlsRef.current;
+    if (controls) {
+      controls.target.lerp(targetRef.current.lookAt, t * 0.08);
+      controls.update();
+    } else {
+      camera.lookAt(targetRef.current.lookAt);
+    }
   });
 
   return null;
@@ -179,7 +195,7 @@ export function GraphScene({
 
       {hovered && <NodeTooltip node={hovered} />}
 
-      <CameraAnimator target={cameraTarget} />
+      <CameraAnimator target={cameraTarget} controlsRef={controlsRef} />
       <IdleAutoRotate controlsRef={controlsRef} />
 
       <EffectComposer multisampling={GRAPH_COMPOSER_MULTISAMPLING}>

graph-ui/src/components/GraphTab.tsx

@@ -181,7 +181,7 @@ export function GraphTab({ project }: GraphTabProps) {
     return (
       <div className="flex items-center justify-center h-full">
         <p className="text-white/30 text-sm">
-          Select a project from the Stats tab
+          Select a project from the Projects tab
         </p>
       </div>
     );
@@ -309,7 +309,7 @@ export function GraphTab({ project }: GraphTabProps) {
                 setCameraTarget(null);
               }}
             >
-              Clear
+              Clear selection
             </Button>
           )}
           <Button

graph-ui/src/components/Sidebar.tsx

@@ -120,7 +120,12 @@ export function Sidebar({ nodes, onSelectPath, selectedPath }: SidebarProps) {
 
   return (
     <div className="flex flex-col flex-1 min-h-0">
-      <div className="px-3 py-2.5 border-b border-border/30">
+      <div className="px-4 pt-3 pb-2 shrink-0">
+        <span className="text-[11px] font-medium text-foreground/50 uppercase tracking-widest">
+          {t.graph.folders}
+        </span>
+      </div>
+      <div className="px-3 pb-2.5 border-b border-border/30 shrink-0">
         <div className="relative">
           <input
             type="text"

graph-ui/src/lib/i18n.ts

@@ -22,6 +22,7 @@ export const messages = {
       selectedLabel: "Graph",
       search: "Search...",
       clearSelection: "Clear selection",
+      folders: "Folders",
     },
     projects: {
       indexedProjects: "Indexed Projects",
@@ -91,6 +92,7 @@ export const messages = {
       selectedLabel: "图谱",
       search: "搜索...",
       clearSelection: "清除选择",
+      folders: "目录",
     },
     projects: {
       indexedProjects: "已索引项目",