refactor(ui): extract switch controls logic into reusable hook and terminal restoration utility

Extracts duplicated exit/switch confirmation handling from CodexDisplay and RemoteModeDisplay into a custom useSwitchControls hook. Centralizes terminal state restoration (raw mode, keyboard protocol cleanup) into a restoreTerminalState utility function used across codex modules. Improves code reusability and maintainability.

cli/src/codex/runCodex.ts

@@ -4,6 +4,7 @@ import { resolve } from 'node:path';
 
 import { ApiClient } from '@/api/api';
 import { logger } from '@/ui/logger';
+import { restoreTerminalState } from '@/ui/terminalState';
 import { loop, type EnhancedMode, type PermissionMode } from './loop';
 import { MessageQueue2 } from '@/utils/MessageQueue2';
 import { hashObject } from '@/utils/deterministicJson';
@@ -136,6 +137,7 @@ export async function runCodex(opts: {
         }
         cleanupStarted = true;
         logger.debug('[codex] Cleanup start');
+        restoreTerminalState();
         try {
             if (sessionWrapper) {
                 sessionWrapper.stopKeepAlive();