Watchtower 8.1.893 (build 893)

🧩 Corrections

• restore correct Positioned.fill structure (broken Stack children syntax)
• guard _downloadApk() against empty/invalid URL — prevents crash when update response has no downloadUrl

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📱 Installation Android

1. Téléchargez le fichier APK
2. Ouvrez-le sur Android
3. Activez "Sources inconnues" si demandé