fix: Remove incorrect stdin cleanup code

- Remove stdin handler cleanup that was contradicting the comment
- Remove unused stdinHandler and stdinDataListener from PtySession interface
- Stdin is handled via IPC socket, not process.stdin listeners

web/src/server/pty/pty-manager.ts

@@ -1853,15 +1853,7 @@ export class PtyManager extends EventEmitter {
       session.sessionJsonWatcher.close();
     }
 
-    // Clean up stdin handlers if they exist
+    // Note: stdin handling is done via IPC socket, no global listeners to clean up
-    if (session.stdinHandler) {
-      process.stdin.removeListener('data', session.stdinHandler);
-      session.stdinHandler = undefined;
-    }
-    if (session.stdinDataListener) {
-      process.stdin.removeListener('data', session.stdinDataListener);
-      session.stdinDataListener = undefined;
-    }
 
     // Remove all event listeners for this session
     const listeners = this.sessionEventListeners.get(session.id);

web/src/server/pty/types.ts

@@ -71,8 +71,6 @@ export interface PtySession {
   inputSocketServer?: net.Server;
   sessionJsonWatcher?: fs.FSWatcher;
   sessionJsonDebounceTimer?: NodeJS.Timeout | null;
-  stdinHandler?: (data: string) => void;
-  stdinDataListener?: (data: Buffer) => void;
   stdoutQueue?: WriteQueue;
   // Terminal title mode
   titleMode?: TitleMode;