v1.0.36 — Crew Network + nostr-vpn integration

NEW: Crew Network in Settings
- Private encrypted mesh networking for your skate crew via nostr-vpn
- Your Nostr keys are your device identity — no new accounts needed
- Live QR code generator for nostr-vpn join requests
- One-tap deep link to open directly in the nostr-vpn app
- Save QR as PNG to share with your crew admin
- Platform-aware download links (iOS, Android, macOS/Linux/Windows)
- Fallback: if nostr-vpn isn't installed, redirects to the right store

IMPROVED: Settings accessibility
- All buttons now have keyboard focus rings (WCAG 2.1 AA)
- Screen reader support: aria-labels, role="img" on QR canvas
- Semantic HTML: ordered lists for steps, proper list roles
- Higher contrast URI preview text
- URI box is directly selectable/copyable

Use the Crew Network to share secret spots, transfer raw video files,
and keep crew comms off centralized platforms.