Problem: tapping 'Aggiorna ora' showed a fleeting 'Download avviato'
Toast and then nothing — no feedback on download progress, installer
state, success or failure.
Solution — setInstallUI() central helper:
- Updates the wizard step-3 status card (icon + title + detail line)
OR the update banner (tvUpdateMessage) depending on which is visible
- Always updates and enables/disables the button that triggered the flow
States shown (status card + button text):
⏳ Scaricamento in corso… (download started)
⏳ Installazione in corso… (download done, PackageInstaller running)
⏳ Installazione in corso… + 'Conferma nel dialog…' (user action needed)
✅ Installato con successo! (onActivityResult RESULT_OK or STATUS_SUCCESS)
→ after 3 s auto-refreshes gateway status + closes banner
❌ Download fallito / Installazione non riuscita
→ button re-enabled as '↩ Riprova'
Strings added (EN default + IT + DE):
install_downloading, install_downloading_detail
install_installing, install_confirm_detail
install_success, install_success_detail
install_error_download, install_error_download_detail
install_perm_detail, install_btn_retry
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