Fix Settings UI reactivity, resolve compiler warnings, update .gitignore

- Make screen capture permission and battery optimization states reactive
- Add lifecycle observer to refresh battery status on resume
- Add lifecycle-runtime-compose dependency for non-deprecated LocalLifecycleOwner
- Replace deprecated LocalLifecycleOwner import
- Remove unused REQUEST_CODE constant
- Use KTX createBitmap() and bitmap[x,y] extensions
- Add misc.xml and junie.xml to .gitignore

android/app/build.gradle.kts

@@ -64,6 +64,7 @@ dependencies {
 
     // Lifecycle service
     implementation(libs.lifecycle.service)
+    implementation(libs.lifecycle.runtime.compose)
 
     // Navigation
     implementation(libs.navigation.compose)