fix(web-ui): correct composer inline reference pills and the '@' picker

src/web-ui/src/flow_chat/components/ChatInput.tsx

@@ -217,6 +217,7 @@ import {
   replaceLeadingSlashCommandWithSkillToken,
 } from '../utils/skillPromptReference';
 import { resolveChatInputQuickSkillShortcuts } from '../utils/chatInputQuickSkills';
+import { contextPickerOwnsKey } from '../utils/chatInputKeyOwnership';
 import { useDeepReviewConsent } from './DeepReviewConsentDialog';
 import { useSessionReviewActivity } from '../hooks/useSessionReviewActivity';
 import { shouldBlockReviewCommand } from '../utils/deepReviewCommandGuard';
@@ -5619,6 +5620,12 @@ export const ChatInput: React.FC<ChatInputProps> = ({
       return;
     }
 
+    // The '@' reference picker owns its navigation and acceptance keys through
+    // its overlay layer, which the coordinator routes after React handlers.
+    if (contextPickerOwnsKey({ contextPickerActive: contextTriggerState.isActive, key: e.key })) {
+      return;
+    }
+
     if (slashCommandState.isActive) {
         const items = getActiveSlashPickerItems();
         const maxIndex = Math.max(0, items.length - 1);
@@ -5813,7 +5820,7 @@ export const ChatInput: React.FC<ChatInputProps> = ({
       handleSendOrCancel();
     }
 
-  }, [canUseThreadGoal, handleSendOrCancel, submitBtwFromInput, submitGoalFromInput, derivedState, dispatchInput, slashCommandState, getActiveSlashPickerItems, selectSlashCommandAction, selectSlashExternalPromptCommand, selectSlashPromptCommand, selectSlashAcpCommand, selectSlashSkill, getRichTextTriggerController, historyIndex, inputHistory, savedDraft, inputState.value, hasSendableInput, currentSessionId, isBtwSession, showTargetSwitcher, setInputTarget, removeContext, t]);
+  }, [canUseThreadGoal, handleSendOrCancel, submitBtwFromInput, submitGoalFromInput, derivedState, dispatchInput, slashCommandState, contextTriggerState.isActive, getActiveSlashPickerItems, selectSlashCommandAction, selectSlashExternalPromptCommand, selectSlashPromptCommand, selectSlashAcpCommand, selectSlashSkill, getRichTextTriggerController, historyIndex, inputHistory, savedDraft, inputState.value, hasSendableInput, currentSessionId, isBtwSession, showTargetSwitcher, setInputTarget, removeContext, t]);
 
   const handleImeCompositionStart = useCallback(() => {
     isImeComposingRef.current = true;

src/web-ui/src/flow_chat/components/RichTextInput.scss

@@ -153,6 +153,10 @@
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;
+  // Centering the label line box leaves the lowercase text body about 1px below
+  // the optically centered badge icon and dismiss glyph. Lift the label so all
+  // three read as one row.
+  transform: translateY(-1px);
 }
 
 .rich-text-tag-pill__badge {

src/web-ui/src/flow_chat/components/RichTextInput.test.tsx

@@ -138,19 +138,38 @@ describeWithJsdom('RichTextInput external sync', () => {
 
   function paste(
     editor: HTMLDivElement,
-    options: { items?: Array<{ kind: string; type: string; getAsFile: () => File | null }>; types?: string[]; text?: string },
+    options: {
+      items?: Array<{ kind: string; type: string; getAsFile: () => File | null }>;
+      types?: string[];
+      text?: string;
+      html?: string;
+    },
   ) {
     const event = new window.Event('paste', { bubbles: true, cancelable: true });
     Object.defineProperty(event, 'clipboardData', {
       value: {
         items: options.items ?? [],
         types: options.types ?? [],
-        getData: (type: string) => type === 'text/plain' ? options.text ?? '' : '',
+        getData: (type: string) => {
+          if (type === 'text/plain') return options.text ?? '';
+          if (type === 'text/html') return options.html ?? '';
+          return '';
+        },
       },
     });
     editor.dispatchEvent(event);
   }
 
+  function copy(editor: HTMLDivElement) {
+    const clipboard = new Map<string, string>();
+    const event = new window.Event('copy', { bubbles: true, cancelable: true });
+    Object.defineProperty(event, 'clipboardData', {
+      value: { setData: (type: string, value: string) => clipboard.set(type, value) },
+    });
+    editor.dispatchEvent(event);
+    return clipboard;
+  }
+
   function setCaret(editor: HTMLDivElement, offset: number) {
     const selection = window.getSelection();
     const range = document.createRange();
@@ -263,6 +282,89 @@ describeWithJsdom('RichTextInput external sync', () => {
     expect(editor.querySelector('[data-large-paste-placeholder]')).toBeTruthy();
   });
 
+  it('rebuilds capsules from pasted inline token text', async () => {
+    const onChange = vi.fn();
+    await act(async () => {
+      root.render(
+        <RichTextInput
+          value=""
+          onChange={onChange}
+          contexts={emptyContexts}
+          onRemoveContext={() => {}}
+        />,
+      );
+    });
+    const editor = container.querySelector('.rich-text-input') as HTMLDivElement;
+    setCaret(editor, 0);
+
+    paste(editor, { types: ['text/plain'], text: 'run [$pdf] and [$doc] please' });
+
+    const pills = Array.from(
+      editor.querySelectorAll<HTMLElement>('[data-inline-token-type="skill-ref"]'),
+    );
+    expect(pills.map(pill => pill.dataset.tagFormat)).toEqual(['[$pdf]', '[$doc]']);
+    expect(editor.textContent).toBe('run pdf× and doc× please');
+    expect(onChange).toHaveBeenLastCalledWith('run [$pdf] and [$doc] please', emptyContexts);
+  });
+
+  it('restores capsules from the composer clipboard payload of a copied message', async () => {
+    const onChange = vi.fn();
+    await act(async () => {
+      root.render(
+        <RichTextInput
+          value=""
+          onChange={onChange}
+          contexts={emptyContexts}
+          onRemoveContext={() => {}}
+        />,
+      );
+    });
+    const editor = container.querySelector('.rich-text-input') as HTMLDivElement;
+    setCaret(editor, 0);
+
+    paste(editor, {
+      types: ['text/plain', 'text/html'],
+      text: '[Skill: pdf] summarize it',
+      html: '<div data-openbitfun-composer-clipboard="1" '
+        + 'data-openbitfun-composer-clipboard-tokens="[$pdf] summarize it">'
+        + '[Skill: pdf] summarize it</div>',
+    });
+
+    expect(editor.querySelector<HTMLElement>('[data-inline-token-type="skill-ref"]')?.dataset.tagFormat)
+      .toBe('[$pdf]');
+    expect(onChange).toHaveBeenLastCalledWith('[$pdf] summarize it', emptyContexts);
+  });
+
+  it('copies a selection as composer token text with a marked payload', async () => {
+    const inputRef = createRef<RichTextInputElement>();
+    await act(async () => {
+      root.render(
+        <RichTextInput
+          ref={inputRef}
+          value="compare [$pdf] with [$doc]"
+          onChange={() => {}}
+          contexts={emptyContexts}
+          onRemoveContext={() => {}}
+        />,
+      );
+    });
+    const editor = inputRef.current!;
+
+    const selection = window.getSelection()!;
+    const range = document.createRange();
+    range.selectNodeContents(editor);
+    selection.removeAllRanges();
+    selection.addRange(range);
+
+    const clipboard = copy(editor);
+
+    expect(clipboard.get('text/plain')).toBe('compare [$pdf] with [$doc]');
+    const html = clipboard.get('text/html') ?? '';
+    expect(html).toContain('data-openbitfun-composer-clipboard="1"');
+    expect(html).toContain('data-openbitfun-composer-clipboard-tokens="compare [$pdf] with [$doc]"');
+    expect(html).not.toContain('rich-text-tag-pill__remove');
+  });
+
   it('keeps the existing DOM node when parent echoes local input', async () => {
     const harnessRef = createRef<HarnessHandle>();
     const editor = await renderHarness(harnessRef);