feat(wallpaper): add apply_wallpaper workflow and rotation worker

Adds a new apply_wallpaper command and its plumbing across
desktop, mobile, and Android. A WorkManager-based rotation
worker handles applying wallpapers in the background. Wallpaper
state now tracks currentId and imageIds for precise control.

- Introduced apply_wallpaper command across desktop, mobile and Android
- Added WorkManager-based rotation worker to apply wallpapers in the
  background
- Extended wallpaper state with currentId and imageIds and updated schemas/permissions

plugins/android/build.gradle.kts

@@ -37,6 +37,7 @@ dependencies {
     implementation("androidx.core:core-ktx:1.9.0")
     implementation("androidx.appcompat:appcompat:1.6.0")
     implementation("com.google.android.material:material:1.7.0")
+    implementation("androidx.work:work-runtime-ktx:2.10.1")
     testImplementation("junit:junit:4.13.2")
     androidTestImplementation("androidx.test.ext:junit:1.1.5")
     androidTestImplementation("androidx.test.espresso:espresso-core:3.5.1")