Refactor/ble nostr boundaries (#449)

* Refactor: move Nostr embedding and TLVs out of BLE; add NostrEmbeddedBitChat, Packets, PeerIDUtils; centralize MessageDeduplicator; update ChatViewModel to use new helpers; remove AI_CONTEXT.md and CLAUDE.md

* Rename class to BLEService with compatibility alias; move mention parsing out of BLE; emit low-level BLE events to delegate; unify hex helpers; accept 64-hex in isPeerConnected; add PeerIDResolver

* Project: rename file to BLEService.swift and update Xcode project; keep typealias SimplifiedBluetoothService = BLEService for compatibility

* Remove SimplifiedBluetoothService alias; update app code to use BLEService explicitly

* Tests: rename MockSimplifiedBluetoothService to MockBLEService; update typealiases and Xcode project

* Docs: update comments to refer to BLEService (tests, protocol, noise service)

* Tests: rename SimplifiedBluetoothServiceTests to BLEServiceTests; update project references and class names

* Introduce Transport protocol; BLEService conforms; document delegate-only event pattern in BLEService; keep publishers internal for UnifiedPeerService

* Adopt Transport end-to-end: add TransportPeerSnapshot + publishers; BLEService maps to Transport snapshots; UnifiedPeerService consumes Transport; ChatViewModel holds Transport

* Fix Transport integration: replace getPeerFingerprint with getFingerprint(for:); update PrivateChatManager and CommandProcessor to use Transport; add BLEService.getFingerprint(for:); update PeerManager to use Transport

* Refactor transport and BLE/Nostr layers; unify UI events; fix MainActor isolation

- Rename SimplifiedBluetoothService to BLEService and slim responsibilities
- Introduce Transport protocol and peerEventsDelegate for UI updates
- Add NostrTransport and MessageRouter to route PM/read/favorite via BLE or Nostr
- Centralize TLVs, PeerID utils, and MessageDeduplicator outside BLE
- Update UnifiedPeerService and ChatViewModel to use Transport and delegate events
- Fix MainActor isolation: route delegate calls via Task on MainActor; update notifyUI helper
- Adjust related files and tests accordingly

* BLEService: remove internal publishers; switch to delegate-only events

- Drop legacy messages/peers/fullPeers publishers
- Provide lightweight peerSnapshotSubject only to satisfy Transport
- Rework publishFullPeerData to build snapshots from internal state and notify delegate + subject
- Remove all peersPublisher.send call sites
- Keep UnifiedPeerService on delegate updates exclusively

* Remove inlined Nostr send helpers from ChatViewModel; route via MessageRouter

- Replace direct Nostr sends (PM, ACKs, favorites) with MessageRouter
- Add router method for delivery ACKs and implement NostrTransport.sendDeliveryAck
- Simplify ChatViewModel favorite notification path to use router
- Keep Nostr receive handling intact; reduce duplication

* Fix ReadReceipt initializer usage in ChatViewModel (readerID + readerNickname)

* Fix unused variable warning: replace shadowed 'nostrPubkey' bind with boolean check in ChatViewModel

* Fix queued PM format: use TLV for pending messages after Noise handshake

- Pending messages (including first-time favorite notifications) now use the same TLV encoding as normal sends
- Ensures ChatViewModel can decode on first send, even if handshake completes after queuing

---------

Co-authored-by: jack <jackjackbits@users.noreply.github.com>

bitchat/Protocols/BitchatProtocol.swift

@@ -32,7 +32,7 @@
 /// 1. **Creation**: Messages are created with type, content, and metadata
 /// 2. **Encoding**: Converted to binary format with proper field ordering
 /// 3. **Fragmentation**: Split if larger than BLE MTU (512 bytes)
-/// 4. **Transmission**: Sent via SimplifiedBluetoothService
+/// 4. **Transmission**: Sent via BLEService
 /// 5. **Routing**: Relayed by intermediate nodes (TTL decrements)
 /// 6. **Reassembly**: Fragments collected and reassembled
 /// 7. **Decoding**: Binary data parsed back to message objects
@@ -461,6 +461,10 @@ protocol BitchatDelegate: AnyObject {
     func isFavorite(fingerprint: String) -> Bool
     
     func didUpdateMessageDeliveryStatus(_ messageID: String, status: DeliveryStatus)
+
+    // Low-level events for better separation of concerns
+    func didReceiveNoisePayload(from peerID: String, type: NoisePayloadType, payload: Data, timestamp: Date)
+    func didReceivePublicMessage(from peerID: String, nickname: String, content: String, timestamp: Date)
 }
 
 // Provide default implementation to make it effectively optional
@@ -472,6 +476,14 @@ extension BitchatDelegate {
     func didUpdateMessageDeliveryStatus(_ messageID: String, status: DeliveryStatus) {
         // Default empty implementation
     }
+
+    func didReceiveNoisePayload(from peerID: String, type: NoisePayloadType, payload: Data, timestamp: Date) {
+        // Default empty implementation
+    }
+
+    func didReceivePublicMessage(from peerID: String, nickname: String, content: String, timestamp: Date) {
+        // Default empty implementation
+    }
 }
 
 // MARK: - Noise Payload Helpers