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/components/DocList/DocList.tsx

@@ -1,26 +1,71 @@
-import type { DocSummary } from '../../api/client'
+import { useMemo, useState } from 'react'
+import type { DocSummary, Tag, TagColor } from '../../api/client'
 import { DocListItem } from './DocListItem'
+import { SearchBox } from './SearchBox'
+import { TagChip } from './TagChip'
 
 interface Props {
   docs: DocSummary[]
+  roster: Tag[]
   selectedId: string | null
   onSelect: (id: string) => void
   onCreate: () => void
   onDelete: (id: string) => void
+  onToggleTag: (docId: string, tag: Tag) => void
+  onCreateTag: (docId: string, name: string, color: TagColor) => void
 }
 
-// DocList is the 260px sidebar: the document browser plus a New button.
-export function DocList({ docs, selectedId, onSelect, onCreate, onDelete }: Props) {
+// DocList is the sidebar: a cross-document search box, a tag filter bar, the New
+// button, and the document browser (each row showing its tag chips).
+export function DocList({
+  docs,
+  roster,
+  selectedId,
+  onSelect,
+  onCreate,
+  onDelete,
+  onToggleTag,
+  onCreateTag,
+}: Props) {
+  // Active tag filter (null = show all). Cleared automatically if the tag
+  // disappears from the roster.
+  const [filterId, setFilterId] = useState<string | null>(null)
+  const activeFilter = filterId && roster.some((t) => t.id === filterId) ? filterId : null
+
+  const filtered = useMemo(
+    () => (activeFilter ? docs.filter((d) => d.tags.some((t) => t.id === activeFilter)) : docs),
+    [docs, activeFilter],
+  )
+
+  // Only surface tags that are actually in use, so the filter bar stays tidy.
+  const usedTags = useMemo(() => roster.filter((t) => (t.doc_count ?? 0) > 0), [roster])
+
   return (
     <aside
-      className="flex h-full w-[260px] flex-col gap-2 p-3"
+      className="flex h-full w-[280px] flex-col gap-2 p-3"
       style={{ borderRight: '1px solid var(--color-border)' }}
     >
+      <SearchBox onSelect={onSelect} />
+
+      {usedTags.length > 0 && (
+        <div className="flex flex-wrap gap-1 pb-0.5">
+          {usedTags.map((t) => (
+            <TagChip
+              key={t.id}
+              tag={t}
+              count={t.doc_count}
+              active={activeFilter === t.id}
+              onClick={() => setFilterId((cur) => (cur === t.id ? null : t.id))}
+            />
+          ))}
+        </div>
+      )}
+
       <button
         type="button"
         onClick={onCreate}
-        className="flex items-center justify-center gap-2 py-2.5 text-sm font-bold text-white"
-        style={{ borderRadius: 'var(--radius-pill)', background: 'var(--color-accent)' }}
+        className="petal-tap flex items-center justify-center gap-2 text-sm font-bold text-white"
+        style={{ minHeight: 44, borderRadius: 'var(--radius-pill)', background: 'var(--color-accent)' }}
         onMouseEnter={(e) => (e.currentTarget.style.background = 'var(--color-accent-hover)')}
         onMouseLeave={(e) => (e.currentTarget.style.background = 'var(--color-accent)')}
       >
@@ -28,18 +73,21 @@ export function DocList({ docs, selectedId, onSelect, onCreate, onDelete }: Prop
       </button>
 
       <div className="flex flex-1 flex-col gap-0.5 overflow-y-auto">
-        {docs.length === 0 ? (
+        {filtered.length === 0 ? (
           <p className="px-3 py-6 text-center text-xs" style={{ color: 'var(--color-muted)' }}>
-            No documents yet.
+            {activeFilter ? 'No documents with this tag.' : 'No documents yet.'}
           </p>
         ) : (
-          docs.map((doc) => (
+          filtered.map((doc) => (
             <DocListItem
               key={doc.id}
               doc={doc}
               active={doc.id === selectedId}
+              roster={roster}
               onSelect={() => onSelect(doc.id)}
               onDelete={() => onDelete(doc.id)}
+              onToggleTag={onToggleTag}
+              onCreateTag={onCreateTag}
             />
           ))
         )}