refactor: standardize Dart and Android config across all 54 apps

- Bump all apps to sdk >=3.0.0 <4.0.0 and add flutter_lints + a shared
  analysis_options.yaml to every app (flutter analyze is now green repo-wide)
- Fix real compile errors in firebase_google_authentication and image_editor,
  plus deprecated APIs (Matrix4, SvgPicture.color, textScaleFactor),
  missing async 'mounted' guards, and misc lints via dart fix + manual fixes
- Align pubspec 'name' with each folder and Android namespace/applicationId
  with the documented github.nisrulz.* convention
- Convert bmi_calculator from a legacy Flutter module to a standard app
  with a proper android/ scaffold; fix missing android:exported in launcher
  manifests across 22 apps so all Android builds pass
- Untrack generated build files (GeneratedPluginRegistrant,
  .flutter-plugins-dependencies) and ignore them

todo_list_using_provider/lib/main.dart

@@ -9,6 +9,8 @@ void main() {
 }
 
 class MyApp extends StatelessWidget {
+  const MyApp({super.key});
+
   // This widget is the root of your application.
   @override
   Widget build(BuildContext context) {

todo_list_using_provider/lib/models/todo.dart

@@ -9,7 +9,7 @@ class Todo extends ChangeNotifier {
 
   /// Toggles the value of the item and notify to listeners
   void toggle() {
-    this.done = !this.done;
+    done = !done;
     notifyListeners();
   }
 }

todo_list_using_provider/lib/notifiers/todo_list.dart

@@ -1,25 +1,25 @@
 import 'package:flutter/foundation.dart';
-import 'package:flutter_new_provider_todo/models/todo.dart';
+import 'package:todo_list_using_provider/models/todo.dart';
 
 /// This class represents a model
 /// that notify listeners when it has some changes
 class TodoList extends ChangeNotifier {
-  List<Todo> _list = [];
+  final List<Todo> _list = [];
 
   List<Todo> get list => _list;
 
   void add(Todo newItem) {
-    this._list.add(newItem);
+    _list.add(newItem);
     notifyListeners();
   }
 
   void remove(Todo removedItem) {
-    this._list.remove(removedItem);
+    _list.remove(removedItem);
     notifyListeners();
   }
 
   void clearDoneItems() {
-    this._list.removeWhere((Todo element) => element.done);
+    _list.removeWhere((Todo element) => element.done);
     notifyListeners();
   }
 }

todo_list_using_provider/lib/widgets/add_button.dart

@@ -5,6 +5,8 @@ import '../models/todo.dart';
 import '../notifiers/todo_list.dart';
 
 class AddButton extends StatelessWidget {
+  const AddButton({super.key});
+
   @override
   Widget build(BuildContext context) {
     final todoList = Provider.of<TodoList>(context, listen: false);
@@ -13,7 +15,7 @@ class AddButton extends StatelessWidget {
     return FloatingActionButton(
       onPressed: () {
         todoList.add(
-          new Todo(id: '${todoList.list.length}', title: 'tituloTodo${todoList.list.length}')
+          Todo(id: '${todoList.list.length}', title: 'tituloTodo${todoList.list.length}')
         );
       },
       tooltip: 'Increment',

todo_list_using_provider/lib/widgets/todo_list_item_display.dart

@@ -4,6 +4,8 @@ import 'package:provider/provider.dart';
 import '../models/todo.dart';
 
 class TodoListItemDisplay extends StatelessWidget {
+  const TodoListItemDisplay({super.key});
+
   @override
   Widget build(BuildContext context) {
     print('rebuilding Todo List Item Display');

todo_list_using_provider/lib/widgets/todo_list_item_toggle_button.dart

@@ -4,6 +4,8 @@ import 'package:provider/provider.dart';
 import '../models/todo.dart';
 
 class TodoListItemToggleButton extends StatelessWidget {
+  const TodoListItemToggleButton({super.key});
+
   @override
   Widget build(BuildContext context) {
     print('build Toggle Item Button');

todo_list_using_provider/lib/widgets/todo_list_item_wdt.dart

@@ -5,11 +5,13 @@ import 'todo_list_item_toggle_button.dart';
 
 
 class TodoListItemWdt extends StatelessWidget {
+  const TodoListItemWdt({super.key});
+
   @override
   Widget build(BuildContext context) {
     print('rebuilding ToDo List Item: ');
 
-    return new Row(
+    return Row(
       mainAxisAlignment: MainAxisAlignment.spaceAround,
       children: [
         TodoListItemDisplay(),

todo_list_using_provider/lib/widgets/todo_list_wdt.dart

@@ -6,6 +6,8 @@ import '../notifiers/todo_list.dart';
 import '../widgets/todo_list_item_wdt.dart';
 
 class TodoListWdt extends StatelessWidget {
+  const TodoListWdt({super.key});
+
   @override
   Widget build(BuildContext context) {
     print('building Todo List Wdt');
@@ -20,7 +22,7 @@ class TodoListWdt extends StatelessWidget {
           itemBuilder: (context, index) {
             return ChangeNotifierProvider<Todo>(
                 create: (context) => todoList.list[index],
-                child: new TodoListItemWdt()
+                child: TodoListItemWdt()
             );
           },
         );