feat: introduce chat sessions and manage chat history

Co-authored-by: aider (openai//models/qwen2.5-coder-32b-instruct-q4_k_m.gguf) <aider@aider.chat>

index.html

@@ -468,6 +468,7 @@ let currentModel = null
 let availableModels = []
 let currentStreamController = null
 let isStreaming = false
+let chatHistory = [] // Initialize chat history array
 
 // Get current API URL based on selected backend
 function getApiUrl() {
@@ -626,6 +627,9 @@ function addMessage(role, content, markdown = false, messageId = null) {
 	chatLog.appendChild(messageDiv)
 	chatLog.scrollTop = chatLog.scrollHeight
 
+	// Add message to chat history
+	chatHistory.push({ role, content, markdown, messageId });
+
 	return contentDiv
 }
 
@@ -1010,6 +1014,9 @@ window.onload = () => {
 	userInput.focus()
 	fetchModels()
 
+	// Load chat history
+	loadChatHistory();
+
 	// Add welcome message
 	setTimeout(() => {
 		const welcomeMessage = `# Welcome to LM Studio Chat! 🚀
@@ -1035,3 +1042,8 @@ I now support **real-time streaming responses** and **dark, readable text format
 </script>
 </body>
 </html>
+function loadChatHistory() {
+    chatHistory.forEach(message => {
+        addMessage(message.role, message.content, message.markdown, message.messageId);
+    });
+}