adapt todo display to the slash/input/session architecture

- TodoPanel mounts through a 'conversation.input.dock' list entry
  (todoDockEntry, QueueDock posture, order -1 above the queue rows) instead
  of a ConversationRoot hardcode; the inner component is unchanged and takes
  useSession from the dock entry's standard kit.
- The verify-todo-display.mjs chromium probe is replaced by an assembled
  keyless snapshot (apps/web/tests/todo-display.snapshot.ts, the
  code-mode-fixture idiom) pinning the TodoRow summary/state, the dock
  panel content, and the collapse round-trip over built bundles.
- Fake snapshots across specs gain the todos field; bilingual note/READMEs
  updated for the dock mount and the snapshot.

packages/todo/tool-todo/README.i18n.yaml

@@ -3,4 +3,4 @@
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write
 README.md: 3615f68953cfe6cdc0e6fc41bf75b8dfdf90a310
-README.zh.md: ee0b99d1b4a444dc0b92217686140f691abf1e2b
+README.zh.md: c4a7d829cc1583b65d2c8afa1683d957f68722e9

packages/todo/tool-todo/README.zh.md

@@ -16,11 +16,11 @@
 
 ## 验证
 
-除 schema 的类型／必填／枚举检查外，`execute` 还会拒绝空或重复的 `content`，以及同时存在多个 `in_progress` 任务的情况（连贯计划最多只有一个活跃任务）。顺序与保持列表最新的纪律由模型根据工具描述负责。
+除 schema 的类型／必填／枚举检查外，`execute` 还会拒绝空或重复的 `content`、同时存在多个 `in_progress` 任务的情况（连贯计划最多只有一个活跃任务），以及 `content`/`status` 之外的任何条目键——扩展条目形状（id、嵌套）会响亮失败而不是被静默压平，保证落日志的快照与模型自认为写入的内容一致。顺序与保持列表最新的纪律由模型根据工具描述负责。
 
 ## 渲染
 
-规范结果为 `{ todos, counts: { pending, inProgress, completed } }`；其 Native 渲染器返回精简的更新确认。工具还会写入完整 `todo/write` 会话事件。UI 订阅事件流，并自行渲染该持久列表：[TUI 应用](../../examples/tui-demo)将其显示为持久计划，[web 客户端](../../client/ui-conversation)则基于 `ConversationSnapshot.todos` 渲染计划条和专属工具行（[Agent Note](../../../.agents/notes/implemented/feature/2026-07-23-web-todo-display.md)）。
+规范结果为 `{ todos, counts: { pending, inProgress, completed } }`；其 Native 渲染器返回精简的更新确认。工具还会写入完整 `todo/write` 会话事件。UI 订阅事件流，并自行渲染该持久列表：[TUI 应用](../../examples/tui-demo)将其显示为持久计划，[web 客户端](../../client/ui-conversation)则基于 `ConversationSnapshot.todos` 渲染计划横条与专属工具行（[Agent Note](../../../.agents/notes/implemented/feature/2026-07-23-web-todo-display.md)）。
 
 ## 导出形状