Fix startup crash: listener methods collided with Activity lifecycle

ControlServer.Listener declared onPause()/onResume(); implementing them in
MainActivity overrode Activity.onPause/onResume without super calls, so the
first resume died with SuperNotCalledException. Renamed to onPauseCast/
onResumeCast (matching onStopCast). Also drop R8 optimize variant.
Verified on a Sony Bravia (Android TV 14). Version 0.1.1.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

app/build.gradle.kts

@@ -11,8 +11,8 @@ android {
         applicationId = "dev.castarr.tv"
         minSdk = 26
         targetSdk = 35
-        versionCode = 1
-        versionName = "0.1.0"
+        versionCode = 2
+        versionName = "0.1.1"
     }
 
     // Release signing from environment (see ~/.keys/castarr-release.env on the
@@ -32,7 +32,7 @@ android {
     buildTypes {
         release {
             isMinifyEnabled = true
-            proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro")
+            proguardFiles(getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro")
             if (storeFileEnv != null) {
                 signingConfig = signingConfigs.getByName("release")
             }