优化: 对话交互修复与界面完善

- 修输入法组词回车直发/分离窗误关/出错后按钮死锁
- 新建任务失败弹窗内联提示,会话切换乐观高亮
- 状态多选联动刷新不再冲空可见行
- 测试连接保留已配开关与权重,防抖按提供商分键
- 代码块复制/长回复折叠带量/队列回填/排队时钟
- 子代理完成卡渲染,死链卡片与引用清理
- 截图渲染换 pro 版依赖,样式 token 化收尾

src/i18n/en/aiChat.ts

@@ -99,6 +99,8 @@ export default {
     queueSave: 'Save',
     queueCancel: 'Cancel',
     queueSendNow: 'Send now',
+    // 3c UX batch addition (I4 queue backfill: pull a queued item back into the input box)
+    queueBackfill: 'Backfill',
 
     // ── Skill ──
     clearSkill: 'Clear skill',
@@ -194,7 +196,7 @@ export default {
 
     // ── Input Augmentation layer: mention/skill injection feedback ──
     // search_files blind search denied by whitelist fallback (no auth dialog; prompt user to use @mention or absolute path)
-    searchFilesBlocked: 'search_files only works inside authorized dirs. Use @[project] to reference or provide an absolute path.',
+    searchFilesBlocked: "search_files only works inside authorized dirs. Use {'@'}[project] to reference or provide an absolute path.",
     // /skill hot reload (ai_reload_skills IPC) success toast
     skillReloaded: 'Skills reloaded',
     // @mention entity resolve failed (id points to a project/task/idea/skill that was deleted or unavailable)
@@ -276,5 +278,11 @@ export default {
     goalsCount: 'Goals ({n})',
     none: 'None',
     projectLabel: "{'@'}Projects",
+
+    // ── 3c UX batch addition (I5 classified send-failure messages): friendly text by
+    //    error kind; {msg} keeps the raw error string for troubleshooting ──
+    sendErrRateLimit: 'Rate limit reached, please retry later (error: {msg})',
+    sendErrQuota: 'AI quota or balance insufficient, check your provider account (error: {msg})',
+    sendErrNetwork: 'Network error or timeout, check your connection and retry (error: {msg})',
   },
 }