Added a lot of functionality. Bugfixes and changes

oAI/Models/Conversation.swift

@@ -13,19 +13,22 @@ struct Conversation: Identifiable, Codable {
     var messages: [Message]
     let createdAt: Date
     var updatedAt: Date
-    
+    var primaryModel: String? // Primary model used in this conversation
+
     init(
         id: UUID = UUID(),
         name: String,
         messages: [Message] = [],
         createdAt: Date = Date(),
-        updatedAt: Date = Date()
+        updatedAt: Date = Date(),
+        primaryModel: String? = nil
     ) {
         self.id = id
         self.name = name
         self.messages = messages
         self.createdAt = createdAt
         self.updatedAt = updatedAt
+        self.primaryModel = primaryModel
     }
     
     var messageCount: Int {