Server check (wizard step 3):
- New horizontal card above the scale question always shows server status
as soon as step 3 is entered: ⏳ checking → ✅ reachable / ⚠️ not reachable
- Pings GET $serverUrl/api/?action=check_update (5 s timeout)
- If reachable: 'Error reporting active — failures sent to GitHub Issues'
- If not reachable: 'Check the URL in step 2' warning
- checkServerReachability() called every time goToStep(3) runs
- Strings added in EN / IT / DE
Signature-conflict fallback (else branch in installWithPackageInstaller):
- When PackageInstaller returns a generic STATUS_FAILURE and the target
package is already installed, a signature conflict is the most likely
cause (CONFLICT/INCOMPATIBLE are caught separately earlier)
- New AlertDialog: 'Disinstalla e riprova' → startActivityForResult
ACTION_DELETE → UNINSTALL_REQUEST → auto-retries install on return
- Only shown when all else has already failed
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