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/widget/dialogs.dart

@@ -163,7 +163,6 @@ Future<void> showErrorDialog(String title, {String description = "", APIResponse
             )
           );
         }
-        break;
       default:
         // Unhandled server response
         children.add(
@@ -180,7 +179,6 @@ Future<void> showErrorDialog(String title, {String description = "", APIResponse
           )
         );
 
-        break;
     }
   }