Fix room message routing and improve room UI

- Fix room field not being properly set in BluetoothMeshService sendMessage
- Make room name header tappable to open sidebar
- Show member count in parentheses next to room name
- Display room members including self with "(you)" indicator
- Show self in room member list with dot indicator
- Disable favorite/chat actions for self in member list
- Fix empty room detection logic

bitchat/Services/BluetoothMeshService.swift

@@ -520,6 +520,9 @@ class BluetoothMeshService: NSObject {
                 timestamp: Date(),
                 isRelay: false,
                 originalSender: nil,
+                isPrivate: false,
+                recipientNickname: nil,
+                senderPeerID: self.myPeerID,
                 mentions: mentions.isEmpty ? nil : mentions,
                 room: room
             )