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/codexLocal.ts

@@ -1,5 +1,6 @@
 import { spawn } from 'node:child_process';
 import { logger } from '@/ui/logger';
+import { restoreTerminalState } from '@/ui/terminalState';
 
 export async function codexLocal(opts: {
     abort: AbortSignal;
@@ -91,5 +92,6 @@ export async function codexLocal(opts: {
         });
     } finally {
         process.stdin.resume();
+        restoreTerminalState();
     }
 }