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/Services/CommandProcessor.swift

@@ -19,9 +19,9 @@ enum CommandResult {
 @MainActor
 class CommandProcessor {
     weak var chatViewModel: ChatViewModel?
-    weak var meshService: SimplifiedBluetoothService?
+    weak var meshService: Transport?
     
-    init(chatViewModel: ChatViewModel? = nil, meshService: SimplifiedBluetoothService? = nil) {
+    init(chatViewModel: ChatViewModel? = nil, meshService: Transport? = nil) {
         self.chatViewModel = chatViewModel
         self.meshService = meshService
     }
@@ -127,7 +127,7 @@ class CommandProcessor {
             }
         } else {
             // In public chat
-            meshService?.sendMessage(emoteContent)
+            meshService?.sendMessage(emoteContent, mentions: [])
         }
         
         return .handled
@@ -145,7 +145,7 @@ class CommandProcessor {
             var blockedNicknames: [String] = []
             if let peers = meshService?.getPeerNicknames() {
                 for (peerID, nickname) in peers {
-                    if let fingerprint = meshService?.getPeerFingerprint(peerID),
+                    if let fingerprint = meshService?.getFingerprint(for: peerID),
                        blockedUsers.contains(fingerprint) {
                         blockedNicknames.append(nickname)
                     }
@@ -160,7 +160,7 @@ class CommandProcessor {
         let nickname = targetName.hasPrefix("@") ? String(targetName.dropFirst()) : targetName
         
         guard let peerID = chatViewModel?.getPeerIDForNickname(nickname),
-              let fingerprint = meshService?.getPeerFingerprint(peerID) else {
+              let fingerprint = meshService?.getFingerprint(for: peerID) else {
             return .error(message: "cannot block \(nickname): not found or unable to verify identity")
         }
         
@@ -200,7 +200,7 @@ class CommandProcessor {
         let nickname = targetName.hasPrefix("@") ? String(targetName.dropFirst()) : targetName
         
         guard let peerID = chatViewModel?.getPeerIDForNickname(nickname),
-              let fingerprint = meshService?.getPeerFingerprint(peerID) else {
+              let fingerprint = meshService?.getFingerprint(for: peerID) else {
             return .error(message: "cannot unblock \(nickname): not found")
         }