Phase 5: voice consistency pass

Tier-1 voice-consistency pass: whole-document LLM review surfacing passages
that read tonally out of place (formal/over-polished/paraphrased-too-closely),
as honey-decorated `voice` flags with no correction (awareness-only).

- internal/llm/voice.go: RunVoice sends the whole document (no TruncateDoc),
  MaxTokens 2048, 20s per-doc floor (VoiceInterval). Standalone voice prompt
  in prompts.go (not bundled with the grammar checkpoint, per spec).
- internal/suggestions: POST /api/docs/:id/voice. replacePending is now
  family-scoped (pendingScope) so grammar and voice never clobber each other's
  pending flags; both passes return the unified pending set. check/voice share
  one runPass helper. TestVoicePassCoexists covers both directions.
- Frontend: api.voiceDoc, useCheckpoint voicing/runVoice, honey "Check my
  voice" toolbar pill, breathing honey dot in StatusBar.

Claude-Session: https://claude.ai/code/session_016Yr6jELuRc7hyzYLccQKZd

web/src/components/Editor/EditorCore.tsx

@@ -26,6 +26,10 @@ interface Props {
   suggestions: Suggestion[]
   onAccept: (s: Suggestion) => void
   onDismiss: (s: Suggestion) => void
+  // Triggers the whole-document voice-consistency pass; `voicing` is true while
+  // it runs (drives the toolbar button's loading state).
+  onVoiceCheck: () => void
+  voicing: boolean
 }
 
 // parseDoc turns the stored content string into a Tiptap doc node, tolerating
@@ -50,7 +54,16 @@ interface HoverState {
 // EditorCore is the Tiptap instance: StarterKit formatting plus underline, text
 // alignment, a placeholder, character counting, and the suggestion-highlight
 // decoration layer. Hovering a highlight opens its SuggestionCard.
-export function EditorCore({ docId, initialContent, onChange, suggestions, onAccept, onDismiss }: Props) {
+export function EditorCore({
+  docId,
+  initialContent,
+  onChange,
+  suggestions,
+  onAccept,
+  onDismiss,
+  onVoiceCheck,
+  voicing,
+}: Props) {
   const wrapperRef = useRef<HTMLDivElement>(null)
   const [hover, setHover] = useState<HoverState | null>(null)
   // Delays card close so the pointer can travel from highlight to card.
@@ -195,7 +208,7 @@ export function EditorCore({ docId, initialContent, onChange, suggestions, onAcc
 
   return (
     <div className="flex flex-1 flex-col">
-      <Toolbar editor={editor} />
+      <Toolbar editor={editor} onVoiceCheck={onVoiceCheck} voicing={voicing} />
       <div
         ref={wrapperRef}
         className="relative flex-1"