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/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

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

@@ -11,6 +11,7 @@
         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"

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,
             ),

bottom_sheet/lib/main.dart

@@ -1,11 +1,13 @@
 import 'package:flutter/material.dart';
-import 'package:project/home.dart';
+import 'package:bottom_sheet/home.dart';
 
 void main() {
   runApp(MyApp());
 }
 
 class MyApp extends StatelessWidget {
+  const MyApp({super.key});
+
   // This widget is the root of your application.
   @override
   Widget build(BuildContext context) {

bottom_sheet/lib/models/ListTileModel.dart

@@ -1,8 +1,8 @@
 import 'package:flutter/material.dart';
 
 ListTile getListTile(icon, iconColor, titleText, context) {
-  return new ListTile(
-    leading: new Container(
+  return ListTile(
+    leading: SizedBox(
       width: 4.0,
       child: Icon(
         icon,
@@ -10,7 +10,7 @@ ListTile getListTile(icon, iconColor, titleText, context) {
         size: 24.0,
       ),
     ),
-    title: new Text(
+    title: Text(
       titleText,
       style: TextStyle(
         fontSize: 14.0,

bottom_sheet/pubspec.yaml

@@ -1,4 +1,4 @@
-name: project
+name: bottom_sheet
 description: A new Flutter project.
 
 # The following line prevents the package from being accidentally published to
@@ -32,6 +32,7 @@ dependencies:
 dev_dependencies:
   flutter_test:
     sdk: flutter
+  flutter_lints: ^6.0.0
 
 # For information on the generic Dart part of this file, see the
 # following page: https://dart.dev/tools/pub/pubspec