fix(kiosk): fallback Intent.ACTION_VIEW when PackageInstaller STATUS=1 + fix self-update URL

- SetupActivity: catch STATUS_FAILURE=1 separately and immediately retry with
  Intent.ACTION_VIEW (system installer dialog) instead of showing a dead error.
  STATUS=1 is a generic PackageInstaller failure that can happen on many
  Android 14 devices even with a valid APK, but the system installer handles it.
- SetupActivity: remove misleading 'incompatibile' hint for status=1 (was wrong;
  STATUS_FAILURE_INCOMPATIBLE = 7, not 1).
- SetupActivity: deduplicate buildDeviceLabel() to shared private method
- KioskActivity: fix KIOSK_DOWNLOAD_URL to point to kiosk-latest release
  (was pointing to 'latest' which only has the gateway APK, so self-update
  was silently broken).
- Bump version 1.4.0 -> 1.5.0 (versionCode 5 -> 6)

evershelf-kiosk/app/build.gradle.kts

@@ -11,8 +11,8 @@ android {
         applicationId = "it.dadaloop.evershelf.kiosk"
         minSdk = 24
         targetSdk = 34
-        versionCode = 5
-        versionName = "1.4.0"
+        versionCode = 6
+        versionName = "1.5.0"
     }
 
     signingConfigs {