fix: add missing cancelStream call and return for non-retryable errors

- Add cancelStream() call before showing error dialog for non-retryable errors
- Add return statement to prevent loop continuation after handling non-retryable error

Co-authored-by: nate <[email protected]>

Generated with [Continue](https://continue.dev)

Co-Authored-By: Continue <[email protected]>

Author: continue[bot]

gui/src/redux/thunks/streamThunkWrapper.tsx

@@ -51,6 +51,7 @@ export const streamThunkWrapper = createAsyncThunk<
         await new Promise((resolve) => setTimeout(resolve, delayMs));
         await dispatch(cancelStream());
       } else {
+        await dispatch(cancelStream());
         dispatch(setDialogMessage(<StreamErrorDialog error={e} />));
         dispatch(setShowDialog(true));
 
@@ -62,6 +63,7 @@ export const streamThunkWrapper = createAsyncThunk<
         };
 
         posthog.capture("gui_stream_error", errorData);
+        return;
       }
     }
   }