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

using_listwheelscrollview/lib/listwheel.dart

@@ -1,8 +1,9 @@
-import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'roundcontainer.dart';
 
 class Listwheel extends StatefulWidget {
+  const Listwheel({super.key});
+
   @override
   _ListwheelState createState() => _ListwheelState();
 }
@@ -16,6 +17,10 @@ class _ListwheelState extends State<Listwheel> {
       backgroundColor: Colors.white70,
       body: Container(
         child: ListWheelScrollView(
+          squeeze: 1.0,
+          itemExtent: 180,
+          diameterRatio: 1.9,
+          offAxisFraction: -0.5,
           children: [
             NewWidget(
                 size: size,
@@ -74,10 +79,6 @@ class _ListwheelState extends State<Listwheel> {
                 ),
                 s: 'Email'),
           ],
-          squeeze: 1.0,
-          itemExtent: 180,
-          diameterRatio: 1.9,
-          offAxisFraction: -0.5,
         ),
       ),
     );

using_listwheelscrollview/lib/main.dart

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

using_listwheelscrollview/lib/roundcontainer.dart

@@ -3,8 +3,9 @@ import 'package:flutter/material.dart';
 class NewWidget extends StatelessWidget {
   final Widget l;
   final String s;
-  double radius = 8;
-  NewWidget({required this.size, required this.l, required this.s});
+  final double radius = 8;
+  const NewWidget(
+      {super.key, required this.size, required this.l, required this.s});
   final double size;
 
   @override
@@ -20,7 +21,7 @@ class NewWidget extends StatelessWidget {
           BoxShadow(
             offset: Offset(5, 5),
             blurRadius: radius,
-            color: Color(0XFF585858).withOpacity(.3),
+            color: Color(0XFF585858).withValues(alpha: .3),
           ),
         ],
       ),