Phase 2: document CRUD + auto-save

Backend internal/docs: chi sub-router (list/create/get/update/delete)
mounted at /api/docs, scoped to the local user. Create uses RETURNING;
update is a COALESCE partial-update so rename and full editor save share
one PUT. JSON 404/400 errors; handlers_test.go walks the lifecycle.

Frontend: api/client.ts, useAutoSave (1.5s debounce + saveNow flush
before doc switch), EditorCore (Tiptap StarterKit/Underline/TextAlign/
Placeholder/CharacterCount) + Toolbar, DocList/DocListItem, StatusBar,
and an App.tsx that orchestrates load/select/create/delete with
optimistic sidebar patching. content + content_text + word_count are
emitted together on every edit. .petal-prose styling (Lora body, Nunito
headings).

Verified: tsc clean, vite build, go build, full CRUD smoke test incl.
CJK title round-trip and SPA serve.

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

web/src/components/DocList/DocListItem.tsx

@@ -0,0 +1,48 @@
+import type { DocSummary } from '../../api/client'
+
+interface Props {
+  doc: DocSummary
+  active: boolean
+  onSelect: () => void
+  onDelete: () => void
+}
+
+// One row in the sidebar: title + word count, a delete affordance on hover, and
+// a rose wash when it's the open document.
+export function DocListItem({ doc, active, onSelect, onDelete }: Props) {
+  return (
+    <div
+      onClick={onSelect}
+      className="group flex cursor-pointer items-center gap-2 px-3 py-2.5"
+      style={{
+        borderRadius: 'var(--radius-card)',
+        background: active ? 'var(--color-surface)' : 'transparent',
+        boxShadow: active ? 'var(--shadow-soft)' : 'none',
+      }}
+    >
+      <div className="min-w-0 flex-1">
+        <div
+          className="truncate text-sm font-semibold"
+          style={{ color: active ? 'var(--color-plum)' : 'var(--color-muted)' }}
+        >
+          {doc.title || 'Untitled'}
+        </div>
+        <div className="text-xs" style={{ color: 'var(--color-muted)' }}>
+          {doc.word_count} {doc.word_count === 1 ? 'word' : 'words'}
+        </div>
+      </div>
+      <button
+        type="button"
+        aria-label="Delete document"
+        onClick={(e) => {
+          e.stopPropagation()
+          onDelete()
+        }}
+        className="flex h-6 w-6 shrink-0 items-center justify-center text-base opacity-0 group-hover:opacity-100"
+        style={{ borderRadius: 'var(--radius-pill)', color: 'var(--color-muted)' }}
+      >
+        ×
+      </button>
+    </div>
+  )
+}