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

news_memes_app/lib/Screens/HomePage.dart

@@ -5,7 +5,7 @@ import 'package:news_memes_app/Screens/NewsScreen.dart';
 import 'package:news_memes_app/services/getNews.dart';
 
 class HomePage extends StatefulWidget {
-  const HomePage({Key? key}) : super(key: key);
+  const HomePage({super.key});
 
   @override
   _HomePageState createState() => _HomePageState();

news_memes_app/lib/Screens/MemeScreen.dart

@@ -4,7 +4,7 @@ import 'package:news_memes_app/services/getMemes.dart';
 import 'package:share_plus/share_plus.dart';
 
 class MemeScreen extends StatefulWidget {
-  const MemeScreen({Key? key}) : super(key: key);
+  const MemeScreen({super.key});
 
   @override
   _MemeScreenState createState() => _MemeScreenState();

news_memes_app/lib/Screens/NewsScreen.dart

@@ -4,17 +4,13 @@ import 'package:news_memes_app/services/getNews.dart';
 class NewsScreen extends StatefulWidget {
   final List<NewsModel> news;
 
-  NewsScreen(this.news);
+  const NewsScreen(this.news, {super.key});
 
   @override
-  _NewsScreenState createState() => _NewsScreenState(news);
+  State<NewsScreen> createState() => _NewsScreenState();
 }
 
 class _NewsScreenState extends State<NewsScreen> {
-  List<NewsModel> news;
-
-  _NewsScreenState(this.news);
-
   @override
   Widget build(BuildContext context) {
     final Size size = MediaQuery.of(context).size;
@@ -25,7 +21,7 @@ class _NewsScreenState extends State<NewsScreen> {
           child: InteractiveViewer(
             child: ListView(
               // magnification: 1.2,
-              children: news
+              children: widget.news
                   .map((e) => Padding(
                         padding: const EdgeInsets.symmetric(
                             vertical: 15, horizontal: 20),