feat(app): session timeline/turn rework (#13196)

Co-authored-by: David Hill <iamdavidhill@gmail.com>

packages/app/src/i18n/zh.ts

@@ -244,6 +244,7 @@ export const dict = {
 
   "prompt.placeholder.shell": "输入 shell 命令...",
   "prompt.placeholder.normal": '随便问点什么... "{{example}}"',
+  "prompt.placeholder.simple": "随便问点什么...",
   "prompt.placeholder.summarizeComments": "总结评论…",
   "prompt.placeholder.summarizeComment": "总结该评论…",
   "prompt.mode.shell": "Shell",
@@ -500,6 +501,9 @@ export const dict = {
   "session.messages.loading": "正在加载消息...",
   "session.messages.jumpToLatest": "跳转到最新",
   "session.context.addToContext": "将 {{selection}} 添加到上下文",
+  "session.todo.title": "待办事项",
+  "session.todo.collapse": "折叠",
+  "session.todo.expand": "展开",
   "session.new.worktree.main": "主分支",
   "session.new.worktree.mainWithBranch": "主分支（{{branch}}）",
   "session.new.worktree.create": "创建新的 worktree",