Sync: Secure Chat & Private AI

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• New Setup Tour: Simple guided tour to connect via username, phone, or QR code.
• Photo Editor: Crop, annotate, filter, or blur details before sending.
• Upgraded Engine: Faster delivery, offline auto-resends with no duplicates, and background sync.
• Cross-Device Sync: Hidden chats & PINs sync instantly across devices.
• Fixed file download issues and long message displays in groups.