fix: polish pass — dark mode, notifications, icons, edge-to-edge

- Wrap SettingsScreen in Scaffold to fix invisible text in dark mode
- Fix notification showing raw ICY metadata instead of parsed track info
- Add proper white-on-transparent notification icon
- Create branded adaptive launcher icon (amber tower on BlueGray900)
- Add edge-to-edge support with proper window inset handling
- Add About section to Settings with version and app info
- Enable BuildConfig generation for version display

Made-with: Cursor

app/build.gradle.kts

@@ -36,6 +36,7 @@ android {
     }
     buildFeatures {
         compose = true
+        buildConfig = true
     }
 }