Changelog

GUI version (branch `feature/gui`)

Added a GUI version of the app (FIBA3X3-GUI.exe): a simple window to edit
the API Key, Event ID and WebSocket URL, save them to config.json, and see a
live connection/auth status.
This GUI version lives on the feature/gui branch, kept separate from
main (which has the console/CLI version).

Turned the script into a reliable, double-clickable app for writing FIBA 3x3
game data to data.xml.

Subscribe flood: the app used to re-send subscribe every 100 ms. Now it
subscribes once and just listens (this is a push feed).
Silent failures: bad or unexpected messages no longer die quietly.

FIBA3X3.exe: double-click to run in a terminal window (no Python needed).
Keep config.json in the same folder. Rebuild anytime with build_exe.bat.
Live logging: status is printed to the console and saved to fiba3x3.log.
Auto-reconnect: recovers on its own if the connection drops.
Auth retry: if the server rejects the API key, it retries a few times, then
shows a red FAILED TO AUTHENTICATE message.
Config check: if config.json still has placeholder values, it tells you
exactly what to fix instead of crashing.
Atomic writes: data.xml is never read half-written.

The FIBA feed sends updates at most every 100 ms; faster isn't possible
from the server.
apiKey, eventId, and webSocketUrl must all come from the same Venue
Server session, or the server rejects the key.