Editor: Find & Replace, read-aloud, backup, typography, phonetic, org niceties

Writer power-ups (Phase 11), plus the selection-bubble vs copy/paste fix.

- Find & Replace (Ctrl/Cmd+F): SearchHighlight decoration extension +
  FindReplace bar (match-case, replace-all back-to-front, scroll without
  popping the selection bubble).
- Read-aloud (Web Speech, offline) on the word card and selection bubble.
- Keyboard/touch access to the ESL helpers: Ctrl/Cmd+D look up word at caret,
  Ctrl/Cmd+J rewrite selection, touch long-press lookup. Refactored the
  right-click handler into a shared openWordLookup(pos).
- Whole-corpus backup: GET /api/docs/export-all zips every doc (md/docx),
  de-dupes filenames, dated name; sidebar download links. TestExportAll.
- Smart typography input rules (curly quotes/em-dash/ellipsis), ASCII-only so
  CJK is untouched.
- Duplicate doc, sidebar sort (Recent/Title/Longest), toolbar outline popover.
- English phonetic (chosen over pinyin for an English learner): ECDICT-built
  phonetic.json.gz (46,579 words) + Result.Phonetic + WordCard IPA line;
  scripts/build_phonetic.py (full build + --seed fallback).
- Selection bubble no longer blocks copy/paste: deferred to pointer-up and made
  click-through except on its buttons.

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

web/src/App.tsx

@@ -192,6 +192,38 @@ export default function App() {
     setDocText('')
   }, [saveNow, isBlankDraft])
 
+  // Duplicate a document: copy its body/tone into a fresh doc titled "… (副本)",
+  // then open the copy. Tags aren't carried over (a fresh start for the copy).
+  const handleDuplicate = useCallback(
+    async (id: string) => {
+      try {
+        await saveNow() // flush in case we're duplicating the open doc
+        const src = await api.getDoc(id)
+        const fresh = await api.createDoc()
+        const dupTitle = `${src.title?.trim() || 'Untitled'} (副本)`
+        const updated = await api.updateDoc(fresh.id, {
+          title: dupTitle,
+          content: src.content,
+          content_text: src.content_text,
+          tone: src.tone,
+          word_count: src.word_count,
+        })
+        setDocs((prev) => [
+          { id: updated.id, title: updated.title, word_count: updated.word_count, updated_at: updated.updated_at, tags: [] },
+          ...prev,
+        ])
+        setCurrentDoc(updated)
+        setTitle(updated.title)
+        setWordCount(updated.word_count)
+        setTone(updated.tone || 'general')
+        setDocText(updated.content_text)
+      } catch (err) {
+        console.error('duplicate failed', err)
+      }
+    },
+    [saveNow],
+  )
+
   const handleDelete = useCallback(
     async (id: string) => {
       await api.deleteDoc(id)
@@ -371,6 +403,7 @@ export default function App() {
             onSelect={openDoc}
             onCreate={handleCreate}
             onDelete={handleDelete}
+            onDuplicate={handleDuplicate}
             onToggleTag={handleToggleTag}
             onCreateTag={handleCreateTag}
           />