Fix room UI and membership tracking issues

- Add lock icon to room header for password management
- Change "leave" to "leave room" for clarity
- Fix bug where non-members appeared in room member list
- Only process room messages if user has joined the room
- Initialize room data structures on app launch
- Prevent auto-join when just mentioning a room

bitchat/ViewModels/ChatViewModel.swift

@@ -112,6 +112,15 @@ class ChatViewModel: ObservableObject {
     private func loadJoinedRooms() {
         if let savedRooms = userDefaults.stringArray(forKey: joinedRoomsKey) {
             joinedRooms = Set(savedRooms)
+            // Initialize empty data structures for joined rooms
+            for room in joinedRooms {
+                if roomMessages[room] == nil {
+                    roomMessages[room] = []
+                }
+                if roomMembers[room] == nil {
+                    roomMembers[room] = []
+                }
+            }
         }
     }
     
@@ -856,11 +865,8 @@ extension ChatViewModel: BitchatDelegate {
         } else if let room = message.room {
             // Room message
             
-            // Auto-join room if we see a message for it
-            if !joinedRooms.contains(room) {
-                joinRoom(room)
-            }
-            
+            // Only process room messages if we've joined this room
+            if joinedRooms.contains(room) {
                 // Add to room messages
                 if roomMessages[room] == nil {
                     roomMessages[room] = []
@@ -883,6 +889,10 @@ extension ChatViewModel: BitchatDelegate {
                 if currentRoom != room {
                     unreadRoomMessages[room] = (unreadRoomMessages[room] ?? 0) + 1
                 }
+            } else {
+                // We're not in this room, ignore the message
+                bitchatLog("Ignoring message for room \(room) - not joined", category: "room")
+            }
         } else {
             // Regular public message (main chat)
             messages.append(message)

bitchat/Views/ContentView.swift

@@ -259,11 +259,35 @@ struct ContentView: View {
                     
                     Spacer()
                     
+                    // Password button for room creator
+                    if viewModel.roomCreators[currentRoom] == viewModel.meshService.myPeerID || viewModel.roomCreators[currentRoom] == nil {
+                        Button(action: {
+                            // Toggle password protection
+                            if viewModel.passwordProtectedRooms.contains(currentRoom) {
+                                viewModel.removeRoomPassword(for: currentRoom)
+                            } else {
+                                // Show password input
+                                showPasswordInput = true
+                                passwordInputRoom = currentRoom
+                            }
+                        }) {
+                            Image(systemName: viewModel.passwordProtectedRooms.contains(currentRoom) ? "lock.open" : "lock")
+                                .font(.system(size: 14))
+                                .foregroundColor(secondaryTextColor)
+                                .padding(6)
+                                .overlay(
+                                    RoundedRectangle(cornerRadius: 4)
+                                        .stroke(secondaryTextColor.opacity(0.5), lineWidth: 1)
+                                )
+                        }
+                        .buttonStyle(.plain)
+                    }
+                    
                     // Leave room button
                     Button(action: {
                         viewModel.leaveRoom(currentRoom)
                     }) {
-                        Text("leave")
+                        Text("leave room")
                             .font(.system(size: 12, design: .monospaced))
                             .foregroundColor(Color.red)
                             .padding(.horizontal, 8)
@@ -611,7 +635,7 @@ struct ContentView: View {
                                                 Button(action: {
                                                     viewModel.leaveRoom(room)
                                                 }) {
-                                                    Text("leave")
+                                                    Text("leave room")
                                                         .font(.system(size: 10, design: .monospaced))
                                                         .foregroundColor(secondaryTextColor)
                                                         .padding(.horizontal, 8)