优化: F-09生成中新建对话不中断(决策e)

去中断弹窗+去generatingConvs.clear(对齐switchConversation真并发)+死key清理;vue-tsc✅

src/i18n/en/aiChat.ts

@@ -115,8 +115,6 @@ export default {
     confirmDeleteActiveConversation: '"{title}" is the chat you are currently viewing. Deleting it will clear the current view and cannot be undone. Continue?',
     clearChat: 'Clear',
     confirmClearChat: 'Are you sure you want to clear all messages in this chat? This cannot be undone.',
-    // UX-08 §3.4: generate-in-progress confirm when starting a new chat (only when generating, otherwise no behavior change)
-    confirmNewConvWhileGenerating: 'Generation is in progress. Interrupt it and start a new chat?',
     toastSendFail: 'Send failed: {msg}',
 
     // ── Message copy (F-260615-13) ──