v2.2.2: Enhanced background persistence and overlay communication

Major improvements to floating window functionality:
- Implemented lazy overlay listener creation/destruction to eliminate ghost overlay
- Added 2Hz cached GPS data push for smooth overlay updates
- Enhanced background persistence with wake locks and heartbeat mechanisms
- Proper Android foreground functionality using bg_launcher package
- Fixed overlay state management race conditions
- Added comprehensive debug logging throughout communication system
- Improved Android manifest with background persistence permissions
- Eliminated overlay status polling interference with data flow

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

android/app/src/main/AndroidManifest.xml

@@ -10,10 +10,17 @@
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE_SPECIAL_USE" />
     
+    <!-- Background persistence permissions -->
+    <uses-permission android:name="android.permission.WAKE_LOCK" />
+    <uses-permission android:name="android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS" />
+    
     <application
         android:label="Speedo"
         android:name="${applicationName}"
-        android:icon="@mipmap/ic_launcher">
+        android:icon="@mipmap/ic_launcher"
+        android:allowBackup="false"
+        android:killAfterRestore="false"
+        android:largeHeap="true">
         <activity
             android:name=".MainActivity"
             android:exported="true"
@@ -22,7 +29,9 @@
             android:theme="@style/LaunchTheme"
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
             android:hardwareAccelerated="true"
-            android:windowSoftInputMode="adjustResize">
+            android:windowSoftInputMode="adjustResize"
+            android:excludeFromRecents="false"
+            android:stateNotNeeded="false">
             <!-- Specifies an Android theme to apply to this Activity as soon as
                  the Android process has started. This theme is visible to the user
                  while the Flutter UI initializes. After that, this theme continues