- Replace synchronous Isar writes with async transactions in `AboutScreen`
- Make `AppLogger.init()` and `dispose()` fully async and guarded with `_busy`
- Remove `StreamController` queue and write directly to the IOSink
- Prevent double‑initialization and race conditions using `_initialized` + `_busy`
- Update log toggle handler to await logger init/dispose for consistency
Fix following Exception when disabling and re-enabling logger:
```
Exception has occurred.
StateError (Bad state: Stream has already been listened to.)
```
- New switch in More > Settings > About
"Enable logging".
When ON, it inits the AppLogger and shows the "Share app logs" button below.
When OFF, it disposes the AppLogger and hides the "Share app logs" button.
It also prevents the AppLogger from init.
OFF by default.
- added localizations accordingly.
