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

bottom_sheet/lib/home.dart

@@ -1,8 +1,8 @@
 import 'package:flutter/material.dart';
-import 'package:project/models/ListTileModel.dart';
+import 'package:bottom_sheet/models/ListTileModel.dart';
 
 class MyHomePage extends StatefulWidget {
-  MyHomePage({super.key, required this.title});
+  const MyHomePage({super.key, required this.title});
 
   final String title;
 
@@ -22,7 +22,7 @@ class _MyHomePageState extends State<MyHomePage> {
         child: Column(
           mainAxisAlignment: MainAxisAlignment.center,
           children: <Widget>[
-            new ElevatedButton(
+            ElevatedButton(
               child: Text(
                 "Bottom Sheet",
                 style: TextStyle(fontSize: 20),
@@ -42,14 +42,14 @@ void _openBottomSheet(context) {
   showModalBottomSheet(
     context: context,
     builder: (builder) {
-      return new Container(
+      return Container(
         padding: EdgeInsets.all(5.0),
-        child: new Wrap(
+        child: Wrap(
           children: <Widget>[
             getListTile(Icons.more, Colors.black45, "More", context),
             getListTile(Icons.favorite, Colors.pink, "Favourites", context),
             getListTile(Icons.account_box, Colors.blue, "Profile", context),
-            new Divider(
+            Divider(
               thickness: 2.0,
               height: 10.0,
             ),