fix: open system installer when OTA session fails

app/src/unstable/java/com/evsuite/abrp/UpdateHook.java

@@ -117,10 +117,12 @@ final class UpdateHook {
         if (apk == null) return "İndirme veya SHA-256 doğrulaması başarısız ("
                 + update.versionName + ")";
 
-        // The cached APK is cleared whichever way install goes: a rejected archive must not
-        // linger, and an accepted one has already been streamed into the installer session.
         OtaUpdater.InstallResult result = OtaUpdater.install(app, apk);
-        if (!apk.delete()) Log.w(TAG, "Could not remove cached OTA APK");
+        // FileProvider's interactive installer opens asynchronously and still needs this file.
+        // Other outcomes have either streamed the bytes already or rejected the archive.
+        if (result != OtaUpdater.InstallResult.INSTALL_UI_STARTED && !apk.delete()) {
+            Log.w(TAG, "Could not remove cached OTA APK");
+        }
 
         switch (result) {
             case SESSION_STARTED:
@@ -128,6 +130,8 @@ final class UpdateHook {
                 // platform may still want the driver to confirm, and either way the verdict
                 // arrives at OtaInstallResultReceiver, not here.
                 return "Kuruluyor: " + update.versionName + " — ekrandaki onayı bekleyin";
+            case INSTALL_UI_STARTED:
+                return "Kurulum ekranı açıldı: " + update.versionName;
             case UNREADABLE_ARCHIVE:
                 return "Kurulum reddedildi: APK okunamadı";
             default: