优化: 设置域体验完善

- 校验失败红框定位字段,保存反馈改持久化成功后
- 数值越界钳制,双提示队列化不再重叠
- 搜索防抖跳分类,托盘气泡文案进多语言

src/i18n/en/settings.ts

@@ -17,7 +17,15 @@ export default {
 
     // ===== Instant feedback (phase 5 SettingRow) =====
     savedHint: '✓ Saved',
+    // False-success family: red inline feedback for persist/IPC failure
+    saveFailedHint: '✗ Save failed',
     nextRoundBadge: 'Next message',
+    // Out-of-range clamp notices (concurrency 1-64 + per-conv ≤ global; temperature reports the corrected value)
+    toastConcurrencyClamped: 'Value out of range, corrected automatically (concurrency 1-{max}; per-conversation capped at global)',
+    toastTempClamped: 'Sampling temperature must be within 0-2, corrected to {v}',
+    // Prompt caching toggle save feedback (previously silent)
+    toastAnthropicCacheSaved: 'Prompt caching setting saved',
+    toastAnthropicCacheFail: 'Failed to save the prompt caching setting',
 
     // ===== Connection mgmt (phase 7: experimental badge, not wired to AI yet) =====
     experimentalBadge: 'Experimental · not wired to AI tools',