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Implements mobile Nostr identity management per issue #29. Android — NIP-55 Amber integration: - Opens com.greenart7c3.nostrsigner via `nostrsigner:` URI scheme to retrieve the user's public key without exposing it to the app. - Listens for the `mobile://nostr-callback` deep link response and stores the resulting npub in Expo SecureStore. - Falls back to Play Store install prompt when Amber is not installed. iOS / manual fallback: - NostrConnectModal accepts an nsec1 paste-in, validates bech32, derives the pubkey via nostr-tools getPublicKey, and stores the key only in Expo SecureStore — never in AsyncStorage, Redux, or logs. Both platforms: - Truncated npub and signer type (Amber / nsec) shown in Settings. - "Disconnect Nostr" wipes all keys from SecureStore and resets state. - Identity persists across restarts via SecureStore. Supporting changes: - NostrContext: new React context for identity lifecycle. - NostrConnectModal: platform-aware bottom-sheet modal for connect flow. - TimmyContext: added apiBaseUrl/setApiBaseUrl/isConnected; URL persisted in AsyncStorage and restored on mount; circular dep broken via refs. - constants/colors: added field, textInverted, destructive, link colours. - constants/storage-keys: added SERVER_URL_KEY. - app.json: added Android intent filter for mobile://nostr-callback. - package.json: added nostr-tools and expo-secure-store dependencies. Fixes #29 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>