feat: send stty resize command on every resize, not just first

Previously the stty command was only sent on the first resize. Now it
is sent every time the terminal dimensions change, so resizing the
browser window or rotating the device properly updates the container
shell size. Added a check to skip when dimensions haven't changed.

apps/api/src/services/terminal_session.py

@@ -142,6 +142,11 @@ class TerminalSession:
         if self._closed:
             logger.warning("Cannot resize: session is closed")
             return
+        
+        # Only resize if dimensions actually changed
+        if self._cols == cols and self._rows == rows:
+            return
+            
         self._cols = cols
         self._rows = rows
         logger.info(f"resize() called for session {self.session_id}: {cols}x{rows}")
@@ -149,12 +154,9 @@ class TerminalSession:
         
         # Docker exec doesn't forward PTY resize to the container process,
         # so we need to explicitly set the size inside the container shell.
-        # Only do this on the first resize to avoid interfering with user input.
-        if not getattr(self, '_stty_sent', False):
-            self._stty_sent = True
-            stty_cmd = f"stty cols {cols} rows {rows}\n".encode()
-            await self.write_input(stty_cmd)
-            logger.info(f"Sent stty command to container for session {self.session_id}: {cols}x{rows}")
+        stty_cmd = f"stty cols {cols} rows {rows}\n".encode()
+        await self.write_input(stty_cmd)
+        logger.info(f"Sent stty command to container for session {self.session_id}: {cols}x{rows}")
 
     async def reset(self) -> None:
         """Reset the session by killing the process and clearing state."""