feat: add biometric authentication support and related UI screens

- Updated AndroidManifest.xml to include permissions for biometric authentication.
- Changed MainActivity to extend FlutterFragmentActivity for better compatibility.
- Modified gradle.properties to optimize memory settings.
- Enhanced app.dart to manage new app phases for biometric authentication.
- Implemented LocalVaultService methods for handling biometric key protection.
- Created BiometricChoiceScreen and BiometricGateScreen for user interaction.
- Updated HomeScreen to handle vault invalidation scenarios.
- Registered local_auth plugin for biometric functionality on macOS and Windows.
- Updated pubspec.yaml and pubspec.lock to include local_auth dependency.

windows/flutter/generated_plugin_registrant.cc

@@ -7,12 +7,15 @@
 #include "generated_plugin_registrant.h"
 
 #include <flutter_secure_storage_windows/flutter_secure_storage_windows_plugin.h>
+#include <local_auth_windows/local_auth_plugin.h>
 #include <screen_retriever_windows/screen_retriever_windows_plugin_c_api.h>
 #include <window_manager/window_manager_plugin.h>
 
 void RegisterPlugins(flutter::PluginRegistry* registry) {
   FlutterSecureStorageWindowsPluginRegisterWithRegistrar(
       registry->GetRegistrarForPlugin("FlutterSecureStorageWindowsPlugin"));
+  LocalAuthPluginRegisterWithRegistrar(
+      registry->GetRegistrarForPlugin("LocalAuthPlugin"));
   ScreenRetrieverWindowsPluginCApiRegisterWithRegistrar(
       registry->GetRegistrarForPlugin("ScreenRetrieverWindowsPluginCApi"));
   WindowManagerPluginRegisterWithRegistrar(