Phase 10: organization & polish — cross-doc search, tags, touch, warm failures

Cross-document FTS5 search (trigram tokenizer for EN + space-free CJK, kept in
sync by triggers, back-filled from existing docs). GET /api/search uses the FTS
index for queries >=3 runes and a LIKE fallback for 1-2 (so 2-char Chinese words
resolve); snippets are built in Go with rune-aware boundaries and sentinel
highlights.

Tags: user-scoped tags + document_tags join (both cascade), idempotent
create/assign, per-tag doc counts. Doc list and search carry each doc's tags
(one tagsByDoc query). Frontend: useTags, TagChip/TagPicker/SearchBox, rewritten
DocList with chips + filter bar + search.

Tablet/touch: responsive sidebar drawer (hamburger + scrim <768px), coarse-
pointer tap targets, tap-to-open + outside-pointerdown-close for suggestion
cards.

Warm LLM-down state: useCheckpoint llmDown flag drives a gentle bilingual
StatusBar note (writing still saves locally).

Migration 0004 (tags + FTS). Tests: tags lifecycle, search EN/CJK/LIKE/update-
reindex. go build/vet/test, tsc, vite all clean; verified live on deployment host.

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

web/src/hooks/useCheckpoint.ts

@@ -13,6 +13,11 @@ export function useCheckpoint(docId: string | null) {
   const [checking, setChecking] = useState(false)
   // True while a whole-document voice pass is in flight (explicit user action).
   const [voicing, setVoicing] = useState(false)
+  // True when the last LLM pass couldn't reach the model (server 502 or network
+  // error). Drives a gentle, reassuring "helper is resting" note — the writing
+  // itself still saves fine, so this is awareness, not an error. Cleared on the
+  // next success or doc switch.
+  const [llmDown, setLlmDown] = useState(false)
 
   const debounceRef = useRef<ReturnType<typeof setTimeout>>(undefined)
   const docIdRef = useRef(docId)
@@ -30,9 +35,11 @@ export function useCheckpoint(docId: string | null) {
       const fresh = await api.checkDoc(id)
       if (run === runRef.current && id === docIdRef.current) {
         setSuggestions(fresh)
+        setLlmDown(false)
       }
     } catch (err) {
       console.error('checkpoint failed', err)
+      if (run === runRef.current) setLlmDown(true)
     } finally {
       if (run === runRef.current) setChecking(false)
     }
@@ -50,9 +57,11 @@ export function useCheckpoint(docId: string | null) {
       const full = await api.voiceDoc(id)
       if (run === runRef.current && id === docIdRef.current) {
         setSuggestions(full)
+        setLlmDown(false)
       }
     } catch (err) {
       console.error('voice pass failed', err)
+      if (run === runRef.current) setLlmDown(true)
     } finally {
       if (run === runRef.current) setVoicing(false)
     }
@@ -72,6 +81,7 @@ export function useCheckpoint(docId: string | null) {
     setSuggestions([])
     setChecking(false)
     setVoicing(false)
+    setLlmDown(false)
     if (!docId) return
     let cancelled = false
     void (async () => {
@@ -94,5 +104,5 @@ export function useCheckpoint(docId: string | null) {
     setSuggestions((prev) => prev.filter((s) => s.id !== id))
   }, [])
 
-  return { suggestions, checking, voicing, schedule, runVoice, removeSuggestion }
+  return { suggestions, checking, voicing, llmDown, schedule, runVoice, removeSuggestion }
 }