feat(kiosk): true kiosk mode, gateway bg launch, update checks, wizard fix v1.2.0

- Screen pinning (startLockTask) blocks home/recent buttons
- Gateway launches in background, kiosk returns to front after 1.5s
- Injected thin green bar at top of WebView for triple-tap exit
- JavaScript bridge for kiosk exit from WebView context
- Update check via GitHub releases API (every 6h)
- Shows banner in WebView when kiosk/gateway updates available
- Setup wizard no longer re-appears after completion/skip (evershelf_setup_done flag)
- REORDER_TASKS permission for moveTaskToFront
- singleTask launch mode for proper kiosk behavior
- Version bumped to 1.2.0 (versionCode 3)

evershelf-kiosk/app/build.gradle.kts

@@ -11,8 +11,8 @@ android {
         applicationId = "it.dadaloop.evershelf.kiosk"
         minSdk = 24
         targetSdk = 34
-        versionCode = 2
-        versionName = "1.1.0"
+        versionCode = 3
+        versionName = "1.2.0"
     }
 
     buildTypes {