Restore interactive re-auth prompt for Google auth CLIs

src/cli/gmail-auth.ts

@@ -135,6 +135,15 @@ async function openBrowser(url: string): Promise<boolean> {
   });
 }
 
+async function promptYesNo(question: string): Promise<boolean> {
+  const readline = await import('readline');
+  const rl = readline.createInterface({ input: process.stdin, output: process.stdout, terminal: true });
+  const answer = await new Promise<string>((resolve) => rl.question(question, resolve));
+  rl.close();
+  const normalized = answer.trim().toLowerCase();
+  return normalized === 'y' || normalized === 'yes';
+}
+
 /** Manual code entry via stdin. */
 async function promptForCode(): Promise<string> {
   const readline = await import('readline');
@@ -182,8 +191,11 @@ export function registerGmailAuthCommand(program: Command): void {
       // 3. Check if already authenticated
       if (existsSync(tokenPath)) {
         console.log(`Token already exists at ${tokenPath}`);
-        console.log('Delete it first if you want to re-authenticate.');
-        process.exit(0);
+        const confirmed = await promptYesNo('Re-authenticate and replace it? (y/N): ');
+        if (!confirmed) {
+          console.log('Cancelled.');
+          process.exit(0);
+        }
       }
 
       const redirectUri = opts.manual