Fix RSSI nil display issue (#316)

* Add comprehensive RSSI debugging logs

- Log RSSI capture during discovery phase
- Log RSSI reading after peripheral connection
- Log didReadRSSI results including validation and retries
- Log getPeerRSSI() calls and dictionary contents
- Log RSSI transfer from temp IDs to real peer IDs
- Add UI logging to trace nil RSSI values in ContentView
- Track RSSI flow from Bluetooth discovery to UI display

* Add detailed logging for RSSI transfer from temp ID to real peer ID

- Log peripheral mapping updates during announce packet handling
- Track connectedPeripherals state before and after mapping
- Log RSSI transfer from peripheralRSSI to peerRSSI
- Identify whether temp ID is found and properly transferred

* Add peripheral lookup fallback for announce packets

- Log whether peripheral is present when announce received
- Add fallback to look up peripheral if not passed as parameter
- This handles cases where announce is received via relay

* Add comprehensive state logging to getPeerRSSI

- Log connectedPeripherals mapping state
- Log peripheralRSSI dictionary contents
- Log UI-side RSSI lookup attempts with dictionary state
- Track exactly what's in the RSSI lookup tables

* Log peer list shown in UI

* Ensure RSSI transfers even when no temp ID mapping exists

* Add debugging for announce packets without peripheral reference

* Fix build errors and add type annotations

* Fix RSSI mapping for relayed announce packets

- Add fallback logic to match unmapped peripherals with announced peers
- Transfer RSSI from temp UUID to real peer ID when single unmapped peripheral exists
- Implement periodic RSSI updates every 10 seconds for all connected peripherals
- Improve RSSI debugging logs to track mapping state

* Fix RSSI mapping condition for single unmapped peripheral

- Remove peerNicknames.count == 0 condition that was preventing mapping
- Map single unmapped peripheral to announcing peer regardless of nickname state
- Remove temp RSSI entries when transferring to real peer ID
- Improve logging to show successful RSSI transfers

* Improve getPeerRSSI to skip temp IDs and check known peers

- Skip temp IDs (non-16 character) when iterating connectedPeripherals
- Add fallback to check peerNicknames for known peers without peripherals
- Check both peerRSSI and peripheralRSSI for known peers
- Improve RSSI lookup coverage for edge cases

* Remove RSSI debug logging and fix build warnings

- Remove all RSSI-related debug logging added during troubleshooting
- Keep functional RSSI tracking code intact
- Fix unused variable warnings in didReadRSSI and updateAllPeripheralRSSI
- Clean up verbose logging while maintaining core functionality

---------

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

bitchat/Views/ContentView.swift

@@ -600,19 +600,27 @@ struct ContentView: View {
                             
                             // Show all connected peers
                             let peersToShow: [String] = viewModel.connectedPeers
+                            let _ = print("ContentView: Showing \(peersToShow.count) peers: \(peersToShow.joined(separator: ", "))")
                             
                             // Pre-compute peer data outside ForEach to reduce overhead
                             let peerData = peersToShow.map { peerID in
-                                PeerDisplayData(
+                                let rssiValue = peerRSSI[peerID]?.intValue
+                                if rssiValue == nil {
+                                    print("ContentView: No RSSI for peer \(peerID) in dictionary with \(peerRSSI.count) entries")
+                                    print("ContentView: peerRSSI keys: \(peerRSSI.keys.joined(separator: ", "))")
+                                } else {
+                                    print("ContentView: RSSI for peer \(peerID) is \(rssiValue!)")
+                                }
+                                return PeerDisplayData(
                                     id: peerID,
                                     displayName: peerID == myPeerID ? viewModel.nickname : (peerNicknames[peerID] ?? "anon\(peerID.prefix(4))"),
-                                    rssi: peerRSSI[peerID]?.intValue,
+                                    rssi: rssiValue,
                                     isFavorite: viewModel.isFavorite(peerID: peerID),
                                     isMe: peerID == myPeerID,
                                     hasUnreadMessages: viewModel.unreadPrivateMessages.contains(peerID),
                                     encryptionStatus: viewModel.getEncryptionStatus(for: peerID)
                                 )
-                            }.sorted { peer1, peer2 in
+                            }.sorted { (peer1: PeerDisplayData, peer2: PeerDisplayData) in
                                 // Sort: favorites first, then alphabetically by nickname
                                 if peer1.isFavorite != peer2.isFavorite {
                                     return peer1.isFavorite