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/analysis_options.yaml

@@ -0,0 +1,23 @@
+# Lint rules for Flutter apps.
+# See https://dart.dev/guides/language/analysis-options
+include: package:flutter_lints/flutter.yaml
+
+analyzer:
+  exclude:
+    - build/**
+    - android/**
+    - ios/**
+    - web/**
+    - windows/**
+    - macos/**
+    - linux/**
+
+linter:
+  rules:
+    # Noise in small sample apps; keep the code readable.
+    avoid_print: false
+    avoid_unnecessary_containers: false
+    file_names: false
+    library_private_types_in_public_api: false
+    non_constant_identifier_names: false
+    strict_top_level_inference: false

news_memes_app/android/app/src/main/AndroidManifest.xml

@@ -5,6 +5,7 @@
         android:icon="@mipmap/ic_launcher">
         <activity
             android:name="io.flutter.embedding.android.FlutterActivity"
+            android:exported="true"
             android:launchMode="singleTop"
             android:theme="@style/LaunchTheme"
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"

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),

news_memes_app/pubspec.yaml

@@ -35,6 +35,7 @@ dependencies:
 dev_dependencies:
   flutter_test:
     sdk: flutter
+  flutter_lints: ^6.0.0
   change_app_package_name: ^1.5.0
 # For information on the generic Dart part of this file, see the
 # following page: https://dart.dev/tools/pub/pubspec