Studio is no longer hardcoded to localhost:50051. A gear icon
in the sidebar footer opens a small settings dialog where the
operator picks host / port / TLS-on-or-off. Saved values
persist via shared_preferences and Studio reconnects to the
new endpoint immediately.
- data/hub.dart: HubService.loadPersistedEndpoint() called once
before the first frame; reconnect() persists on every change.
- widgets/fai_settings_dialog.dart: typed form with port range
validation, live URL preview pill, error surfacing if the
reconnect fails.
- main.dart: gear icon at the sidebar bottom, replaces the
static "platform v0.10.42" footer.
shared_preferences added as dependency. flutter analyze clean,
flutter test 2/2, macOS debug build succeeds.
Bumps fai_studio 0.4.0 -> 0.5.0.
Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>
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