emrg: gui — tiptap rich-text composer (Stage 1)

[argszero]

tiptap rich-text composer — Stage 1 (editor core)

Addresses rant 2026-08-28T14:07:29 (GUI 输入框富文本化, design v1, plan A — pure WYSIWYG).

What changed

• Composer.tsx: replaced the <textarea> with @tiptap/react (useEditor/EditorContent) using @tiptap/starter-kit + @tiptap/extension-link + @tiptap/extension-placeholder + tiptap-markdown for serialization.
• Markdown serialization (core design principle): on send, editor.storage.markdown.getMarkdown() produces the markdown string and the existing sendMessage path is unchanged — history.jsonl, protocol layer and TUI are untouched (storage stays a markdown string, both ends render markdown).
• Preserved behaviors: Enter = send, Shift+Enter = newline (hardBreak), Ctrl+Enter = send, / command menu (now driven by editor.onUpdate + keydown interception), height cap ≤150px, G143 pre-generated requestId, P2 busy-queue injection (emrg: queue messages sent while tool loop busy — inject at round boundary (P1, rant 2026-08-10T21:55:37) #655), G49 failure restore (markdown re-fill via setContent).
• TranscriptView.tsx: user + history messages now render through the existing markdown renderer (TUI UserMarkdown parity) — previously plain text, so **bold** from tiptap would have shown literally. MarkdownText gained a stripMark option (the ✦ strip stays assistant-only).
• layout.css: .tiptap-input contenteditable rules share the textarea flex/scroll/padding; placeholder styling via p.is-editor-empty (theme-guard 2/2 — all colors via tokens.css vars).
• Test migration (per rant): Composer.test.tsx switched from userEvent.type on a textarea to editor-command driven tests (editor.commands.insertContent / direct send); Shell.test.tsx chat-wiring tests type into the contenteditable via userEvent.type. test/setup.ts gained jsdom polyfills prosemirror needs (Text/Range.getClientRects, Range.getBoundingClientRect, document.elementFromPoint).

Acceptance coverage (rant)

• 发送富文本（粗体/链接/列表/代码块）→ 历史存储为等价 markdown 字符串 → transcript 渲染正确: covered by the markdown round-trip test (getMarkdown serialization) + TranscriptView user-markdown render test.
• 旧纯文本消息编辑回显不损坏: setContent(md) round-trip test (plain text in → plain text out).
• / 命令菜单键盘导航不回归: menu navigation tests (↑↓ wrap, Enter select, Esc close) + Shell /help/rename/clear wiring tests.
• GUI 测试全绿: renderer 451/451 + typecheck + build, GUI 87 pass / 8 skip, theme-guard 2/2.

Verification

• emrg/gui/renderer: npm run typecheck clean · npm test 451/451 (44 files) · npm run build OK
• emrg/gui: npm test 87 pass / 8 skip · theme-guard 2/2
• Repo: uv run pytest tests/ 1147 passed + 1 skipped (matches Agent.md)
• Agent.md renderer breakdown updated 449 → 451 (TranscriptView 7→8, Composer 14→15)

Stage 2 (format bar / shortcuts / paste sanitize) lands in a follow-up cycle.

[argszero]

✅ LGTM — cycle (1/3)

Reviewed the full diff (Composer.tsx tiptap migration, TranscriptView user-markdown render, layout.css, test migration + jsdom polyfills). Independent verification on this branch:

• Renderer: npm test 451/451 (44 files), npm run typecheck clean
• GUI: theme-guard 2/2
• CI: test + test-windows both pass (run 33149595609), mergeable CLEAN

Acceptance mapping (rant 2026-08-28T14:07:29):

• Rich text send → markdown stored → transcript renders correctly: covered by markdown round-trip test + TranscriptView user-markdown render test
• Legacy plain-text messages survive setContent round-trip: round-trip test asserts plain text in/out
• / command menu keyboard nav preserved: menu nav tests + Shell wiring tests pass

No issues found. Stage 2 (format bar / shortcuts / paste sanitize) tracked in the rant.

[argszero]

✅ LGTM — cycle (2/3)

Re-verified PR #1062 (tiptap rich-text composer Stage 1):

• Head 1a936e2 unchanged since the (1/3) vote; no new commits
• CI: test + test-windows both pass (run 33149595609)
• mergeable: MERGEABLE / mergeStateStatus: CLEAN
• No ❌ or change requests in between; previous ✅ from cycle 150230 still valid

No issues found. Awaiting 1 more consecutive LGTM from a distinct cycle before merge.

[argszero]

✅ LGTM — cycle (3/3)

Final re-verification of PR #1062 (tiptap rich-text composer Stage 1):

• Head 1a936e2 unchanged since (1/3) and (2/3) votes; no new commits
• CI: test + test-windows both pass (run 33149595609)
• mergeable: MERGEABLE / mergeStateStatus: CLEAN
• Three consecutive ✅ from distinct cycles (150230 → 151203 → this cycle), no ❌ in between

Merging now.