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

persist_key_value/.flutter-plugins-dependencies

@@ -1 +0,0 @@
-{"info":"This is a generated file; do not edit or check into version control.","plugins":{"ios":[{"name":"shared_preferences_foundation","path":"/Users/nishantsrivastava/.pub-cache/hosted/pub.dev/shared_preferences_foundation-2.5.6/","shared_darwin_source":true,"native_build":true,"dependencies":[],"dev_dependency":true}],"android":[{"name":"shared_preferences_android","path":"/Users/nishantsrivastava/.pub-cache/hosted/pub.dev/shared_preferences_android-2.4.27/","native_build":true,"dependencies":[],"dev_dependency":true}],"macos":[{"name":"shared_preferences_foundation","path":"/Users/nishantsrivastava/.pub-cache/hosted/pub.dev/shared_preferences_foundation-2.5.6/","shared_darwin_source":true,"native_build":true,"dependencies":[],"dev_dependency":true}],"linux":[{"name":"path_provider_linux","path":"/Users/nishantsrivastava/.pub-cache/hosted/pub.dev/path_provider_linux-2.2.2/","native_build":false,"dependencies":[],"dev_dependency":true},{"name":"shared_preferences_linux","path":"/Users/nishantsrivastava/.pub-cache/hosted/pub.dev/shared_preferences_linux-2.4.1/","native_build":false,"dependencies":["path_provider_linux"],"dev_dependency":true}],"windows":[{"name":"path_provider_windows","path":"/Users/nishantsrivastava/.pub-cache/hosted/pub.dev/path_provider_windows-2.3.0/","native_build":false,"dependencies":[],"dev_dependency":true},{"name":"shared_preferences_windows","path":"/Users/nishantsrivastava/.pub-cache/hosted/pub.dev/shared_preferences_windows-2.4.1/","native_build":false,"dependencies":["path_provider_windows"],"dev_dependency":true}],"web":[{"name":"shared_preferences_web","path":"/Users/nishantsrivastava/.pub-cache/hosted/pub.dev/shared_preferences_web-2.4.3/","dependencies":[],"dev_dependency":true}]},"dependencyGraph":[{"name":"path_provider_linux","dependencies":[]},{"name":"path_provider_windows","dependencies":[]},{"name":"shared_preferences","dependencies":["shared_preferences_android","shared_preferences_foundation","shared_preferences_linux","shared_preferences_web","shared_preferences_windows"]},{"name":"shared_preferences_android","dependencies":[]},{"name":"shared_preferences_foundation","dependencies":[]},{"name":"shared_preferences_linux","dependencies":["path_provider_linux"]},{"name":"shared_preferences_web","dependencies":[]},{"name":"shared_preferences_windows","dependencies":["path_provider_windows"]}],"date_created":"2026-08-16 19:49:08.125144","version":"3.47.0","swift_package_manager_enabled":{"ios":false,"macos":false}}

persist_key_value/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

persist_key_value/lib/main.dart

@@ -10,6 +10,8 @@ void main() {
 }
 
 class MyHome extends StatefulWidget {
+  const MyHome({super.key});
+
   @override
   MyHomeState createState() {
     return MyHomeState();
@@ -30,7 +32,7 @@ class MyHomeState extends State<MyHome> {
     _loadSavedData();
   }
 
-  _loadSavedData() async {
+  Future<void> _loadSavedData() async {
     // Get shared preference instance
     SharedPreferences prefs = await SharedPreferences.getInstance();
     setState(() {
@@ -39,7 +41,7 @@ class MyHomeState extends State<MyHome> {
     });
   }
 
-  _onIncrementHit() async {
+  Future<void> _onIncrementHit() async {
     // Get shared preference instance
     SharedPreferences prefs = await SharedPreferences.getInstance();
 
@@ -52,7 +54,7 @@ class MyHomeState extends State<MyHome> {
     prefs.setInt(key, counter);
   }
 
-  _onDecrementHit() async {
+  Future<void> _onDecrementHit() async {
     // Get shared preference instance
     SharedPreferences prefs = await SharedPreferences.getInstance();
 
@@ -82,16 +84,14 @@ class MyHomeState extends State<MyHome> {
             children: <Widget>[
               Text(
                 '$counter',
-                textScaleFactor: 10.0,
+                textScaler: TextScaler.linear(10.0),
               ),
               Padding(padding: EdgeInsets.all(10.0)),
               ElevatedButton(
-                  onPressed: _onIncrementHit,
-                  child: Text('Increment Counter')),
+                  onPressed: _onIncrementHit, child: Text('Increment Counter')),
               Padding(padding: EdgeInsets.all(10.0)),
               ElevatedButton(
-                  onPressed: _onDecrementHit,
-                  child: Text('Decrement Counter')),
+                  onPressed: _onDecrementHit, child: Text('Decrement Counter')),
             ],
           ),
         ),

persist_key_value/pubspec.yaml

@@ -12,10 +12,11 @@ dependencies:
   # Use with the CupertinoIcons class for iOS style icons.
   cupertino_icons: ^1.0.9
 
+  shared_preferences: any
 dev_dependencies:
   flutter_test:
     sdk: flutter
-  shared_preferences: ^2.5.5
+  flutter_lints: ^6.0.0
 
 
 # For information on the generic Dart part of this file, see the