Use FVM in GitHub Actions and migrate to Flutter 3.32.4 (#641)

* feat: implement Flutter version management using FVM across CI workflows

* Flutter 3.29.3 + minor Package upgrades

* Replace deprecated `withOpacity`

* Upgrade major package versions without breaking changes.

* Disable unnecessary_async rule

Re-enable later

* New language version and automated fixes

- unnecessary_breaks
- unnecessary_underscore

* Update BUILDING.md to use fvm commands

* Add gitignore files for Android and iOS build artifacts

* Migrate iOS dependencies to Swift Package Manager

This is being done automatically by Flutter

* Flutter 3.32.4

* New sdk version

* docs: add IDE setup instructions and troubleshooting guide for FVM integration

lib/settings/app_settings.dart

@@ -143,14 +143,11 @@ class _InvenTreeAppSettingsState extends State<InvenTreeAppSettingsWidget> {
     switch (screenOrientation) {
       case SCREEN_ORIENTATION_PORTRAIT:
         orientationIcon = Icons.screen_lock_portrait;
-        break;
       case SCREEN_ORIENTATION_LANDSCAPE:
         orientationIcon = Icons.screen_lock_landscape;
-        break;
       case SCREEN_ORIENTATION_SYSTEM:
       default:
         orientationIcon = Icons.screen_rotation;
-        break;
     }
 
     return Scaffold(

lib/settings/barcode_settings.dart

@@ -104,11 +104,9 @@ class _InvenTreeBarcodeSettingsState extends State<InvenTreeBarcodeSettingsWidge
     switch (barcodeScanType) {
       case BARCODE_CONTROLLER_WEDGE:
         barcodeInputIcon = Icon(Icons.barcode_reader);
-        break;
       case BARCODE_CONTROLLER_CAMERA:
       default:
         barcodeInputIcon = Icon(TablerIcons.camera);
-        break;
     }
 
     return Scaffold(