- installApk(): add runtime canRequestPackageInstalls() check with user dialog
(permission may have been revoked or not active even if declared in manifest)
- STATUS_FAILURE else branch: show AlertDialog with full diagnostics on screen
(status code, message, APK size, Android version, device model) so the
problem is visible even when the server error report fails to deliver
- Dialog has Riprova button (retries installWithPackageInstaller immediately)
and Salta button (skips to gateway status check)
- INSTALL_PERM_REQUEST onActivityResult: resume from installApk() if a local
APK file is already present, not just from triggerApkDownload()
- ErrorReporter context enriched with device model string
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