【等待审核】feat(agent): 渐进式标题更新——话题漂移自动重生 + 专用模型配置#1144
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- 普通主会话累计轮次达阈值且检测到话题漂移时，自动基于最近消息重新生成标题
- 新增 REGENERATE_TITLE IPC 通道，支持手动触发重生成（走同一漂移检测逻辑）
- settings 新增 progressiveTitleUpdateEnabled / titleModelChannelId / titleModelId，标题生成可绑定独立模型
- AgentSessionMeta 新增 lastTitleTurn 节流字段，AgentGenerateTitleInput 支持 messages/currentTitle 二选一
- sendMessage 入口持久化 channelId/modelId 到 meta，resolveTitleModel 回退路径对老会话不再秒退
- AgentHeader 的 Sparkles 按钮仅普通主会话渲染，与后端会话类型闸门对齐
- REGENERATE_TITLE IPC 返回结构化 RegenerateTitleResult { ok, reason, title }，前端按 reason 给准确提示，不再用 null 一刀切误报"未偏离"
- bump packages/shared 版本号
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概述
实现渐进式会话标题更新：当对话话题显著偏离当前标题时，自动检测并重新生成标题，使侧边栏与顶栏始终反映最新对话主题。
核心机制
三道闸门节流：仅在普通主会话（排除子会话/定时会话）中生效，设置开关可控，距上次生成≥5轮才触发漂移检测，平衡"锚点稳定"与"及时更新"。
漂移判定：取最近6条消息做摘要，发往LLM比对当前标题——相同则只推进
lastTitleTurn不修改标题，不同则写回新标题。normalizeTitle归一化全角/半角标点空格差异避免假阳性漂移。CAS 并发安全：LLM调用期间若用户推进了新轮次（
lastTitleTurn已变），放弃写回让新一轮完成后重新判断。用户可操作
reason精�确提示（未漂移/无模型/无消息/不支持）改动
packages/shared/src/types/agent.ts(+32)AgentGenerateTitleInput扩展（messages/currentTitle）、RegenerateTitleResult、lastTitleTurn、REGENERATE_TITLE通道常量packages/shared/package.jsonapps/electron/src/main/lib/agent-orchestrator.ts(+403)apps/electron/src/main/lib/agent-service.ts(+8)regenerateAgentTitle导出apps/electron/src/main/lib/agent-session-manager.ts(+2)updateAgentSessionMeta的 Pick 追加lastTitleTurnapps/electron/src/main/lib/settings-service.ts(+3)progressiveTitleUpdateEnabled默认值（true）apps/electron/src/main/ipc.ts(+20)REGENERATE_TITLEhandler + 全窗口广播 TITLE_UPDATEDapps/electron/src/preload/index.ts(+7)regenerateAgentTitle桥接apps/electron/src/types/settings.ts(+6)apps/electron/src/renderer/atoms/ui-preferences.ts(+44)apps/electron/src/renderer/components/agent/AgentHeader.tsx(+68)apps/electron/src/renderer/components/settings/GeneralSettings.tsx(+50)apps/electron/src/renderer/main.tsx(+20)UiPreferencesInitializer扩展测试
紧急度
常规
备注
Closes #1079