Movie genres app improvements

[ndrezn]

Small cleanup worth making on movies app:

• can't close genre boxes so it gets cluttered
• instructional text above the graph overflows its box

[gpaciga]

Also: can open the same genre multiple times.

[red-patience]

Adding https://plotly.atlassian.net/browse/CLD-531: Callback issues

2025-11-27T16:17:06.664Z: [9] [INFO] Starting gunicorn 21.2.0
2025-11-27T16:17:06.664Z: [9] [INFO] Listening at: http://0.0.0.0:8000 (9)
2025-11-27T16:17:06.664Z: [9] [INFO] Using worker: sync
2025-11-27T16:17:06.666Z: [10] [INFO] Booting worker with pid: 10
2025-11-27T16:18:30.651Z: [2025-11-27 16:18:30,649] ERROR in app: Exception on /_dash-update-component [POST]
2025-11-27T16:18:30.651Z: Traceback (most recent call last):
2025-11-27T16:18:30.651Z:   File "/home/appuser/app/.venv/lib/python3.13/site-packages/flask/app.py", line 1511, in wsgi_app
2025-11-27T16:18:30.651Z:     response = self.full_dispatch_request()
2025-11-27T16:18:30.651Z:   File "/home/appuser/app/.venv/lib/python3.13/site-packages/flask/app.py", line 919, in full_dispatch_request
2025-11-27T16:18:30.651Z:     rv = self.handle_user_exception(e)
2025-11-27T16:18:30.651Z:   File "/home/appuser/app/.venv/lib/python3.13/site-packages/flask/app.py", line 917, in full_dispatch_request
2025-11-27T16:18:30.651Z:     rv = self.dispatch_request()
2025-11-27T16:18:30.651Z:   File "/home/appuser/app/.venv/lib/python3.13/site-packages/flask/app.py", line 902, in dispatch_request
2025-11-27T16:18:30.651Z:     return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)  # type: ignore[no-any-return]
2025-11-27T16:18:30.651Z:            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^
2025-11-27T16:18:30.651Z:   File "/home/appuser/app/.venv/lib/python3.13/site-packages/dash/dash.py", line 1484, in dispatch
2025-11-27T16:18:30.651Z:     response_data = ctx.run(partial_func)
2025-11-27T16:18:30.651Z:   File "/home/appuser/app/.venv/lib/python3.13/site-packages/dash/_callback.py", line 698, in add_context
2025-11-27T16:18:30.651Z:     raise err
2025-11-27T16:18:30.651Z:   File "/home/appuser/app/.venv/lib/python3.13/site-packages/dash/_callback.py", line 689, in add_context
2025-11-27T16:18:30.651Z:     output_value = _invoke_callback(func, *func_args, **func_kwargs)  # type: ignore[reportArgumentType]
2025-11-27T16:18:30.651Z:   File "/home/appuser/app/.venv/lib/python3.13/site-packages/dash/_callback.py", line 58, in _invoke_callback
2025-11-27T16:18:30.651Z:     return func(*args, **kwargs)  # %% callback invoked %%
2025-11-27T16:18:30.651Z:   File "/home/appuser/app/app.py", line 357, in show_enhanced_movie_details
2025-11-27T16:18:30.651Z:     selected_genre = genres[clickData["points"][0]["curveNumber"]]
2025-11-27T16:18:30.651Z:                             ~~~~~~~~~^^^^^^^^^^
2025-11-27T16:18:30.651Z: TypeError: 'NoneType' object is not subscriptable

[red-patience]

I'm not able to assign you @ndrezn