Bump version to 0.3.0

Release highlights:
- Concurrent downloads with pause/resume and progress UI
- Community rating display and UI refinements
- Settings menu reorganization with semantic grouping
- UI Density setting (Compact/Normal/Spacious)
- Home screen control legend footer with Y/X shortcuts
- Fix UI hang when deleting large installed files

Author: tmgast

app/build.gradle.kts

@@ -22,8 +22,8 @@ android {
         applicationId = "com.nendo.argosy"
         minSdk = 26
         targetSdk = 34
-        versionCode = 4
-        versionName = "0.2.1"
+        versionCode = 5
+        versionName = "0.3.0"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
         vectorDrawables {