feat: Android companion app remote input, themes, and network layer

- RemoteInputScreen: touch/keyboard relay via WebSocket to /ws/remote-input
- Network layer for server communication
- UI components and NES/Neo theme variants
- Updated navigation, server connect, and WebView screens
- Build config and string resources updates

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Android/app/build.gradle.kts

@@ -82,6 +82,9 @@ dependencies {
     // Splash screen
     implementation("androidx.core:core-splashscreen:1.0.1")
 
+    // OkHttp for WebSocket (remote input)
+    implementation("com.squareup.okhttp3:okhttp:4.12.0")
+
     debugImplementation("androidx.compose.ui:ui-tooling")
     debugImplementation("androidx.compose.ui:ui-test-manifest")
 }