feat: Add community management features with QR code scanning

- Implement Community model for managing community data, including secret handling and PSK derivation.
- Create CommunityQrScannerScreen for scanning and joining communities via QR codes.
- Develop CommunityStore for persisting community data using SharedPreferences.
- Introduce QrCodeDisplay widget for displaying QR codes with customizable options.
- Add QrScannerWidget for reusable QR code scanning functionality with validation and controls.

macos/Flutter/GeneratedPluginRegistrant.swift

@@ -7,6 +7,7 @@ import Foundation
 
 import flutter_blue_plus_darwin
 import flutter_local_notifications
+import mobile_scanner
 import package_info_plus
 import path_provider_foundation
 import shared_preferences_foundation
@@ -16,6 +17,7 @@ import wakelock_plus
 func RegisterGeneratedPlugins(registry: FlutterPluginRegistry) {
   FlutterBluePlusPlugin.register(with: registry.registrar(forPlugin: "FlutterBluePlusPlugin"))
   FlutterLocalNotificationsPlugin.register(with: registry.registrar(forPlugin: "FlutterLocalNotificationsPlugin"))
+  MobileScannerPlugin.register(with: registry.registrar(forPlugin: "MobileScannerPlugin"))
   FPPPackageInfoPlusPlugin.register(with: registry.registrar(forPlugin: "FPPPackageInfoPlusPlugin"))
   PathProviderPlugin.register(with: registry.registrar(forPlugin: "PathProviderPlugin"))
   SharedPreferencesPlugin.register(with: registry.registrar(forPlugin: "SharedPreferencesPlugin"))

macos/Runner/DebugProfile.entitlements

@@ -12,5 +12,7 @@
 	<true/>
 	<key>com.apple.security.device.bluetooth</key>
 	<true/>
+	<key>com.apple.security.device.camera</key>
+	<true/>
 </dict>
 </plist>

macos/Runner/Info.plist

@@ -30,5 +30,7 @@
 	<string>NSApplication</string>
 	<key>NSBluetoothAlwaysUsageDescription</key>
 	<string>MeshCore needs Bluetooth to communicate with LoRa mesh devices</string>
+	<key>NSCameraUsageDescription</key>
+	<string>This app uses the camera to scan QR codes for joining communities.</string>
 </dict>
 </plist>

macos/Runner/Release.entitlements

@@ -8,5 +8,7 @@
 	<true/>
 	<key>com.apple.security.device.bluetooth</key>
 	<true/>
+	<key>com.apple.security.device.camera</key>
+	<true/>
 </dict>
 </plist>