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/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,