v3.3.1

hotfix for v3.3.0 — the flutter gui zip didn't actually work standalone.

it only ever contained the flutter app itself. worked every time i tested it because i was always running it from inside the repo, where the python backend was sitting a few folders up for it to find. extract the zip anywhere else (like literally anyone downloading it off the release page) and it just said "bridge is not running."

fixed: the python backend now gets compiled into its own exe and bundled alongside gui_flutter.exe in the zip. tested by extracting to a folder with nothing else nearby — connects clean now.