Fix two critical session issues in Claude Code IDE

Issue 1: Sessions history not showing in left sidebar
- Converted loadChatHistoryOnLoad IIFE to named loadChatHistory() function
- Added refresh calls in loadSessionMessages() after loading messages
- Added guard to skip refresh if showing "Loading session..." state
- Sidebar now properly shows all active sessions after attachment

Issue 2: New chat session button fails with 'Failed to create session'
- Changed startNewChat() to call loadChatHistory() instead of loadChatView()
- Prevents triggering URL-based attachment logic that was causing confusion
- Sidebar now refreshes correctly without getting stuck in loading state

Also updated cache-bust version to force browser reload.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

public/claude-ide/chat-enhanced.js

@@ -47,7 +47,8 @@ function enhanceChatInput() {
 // ============================================
 
 // Auto-load chat history when page loads
-(async function loadChatHistoryOnLoad() {
+// Make this a named function so it can be called to refresh the sidebar
+async function loadChatHistory() {
   try {
     const res = await fetch('/claude/api/claude/sessions');
     const data = await res.json();
@@ -55,6 +56,13 @@ function enhanceChatInput() {
     const historyList = document.getElementById('chat-history-list');
     if (!historyList) return;
 
+    // Skip update if we're showing "Loading session..." to avoid conflicts
+    // with attachToSession's loading state
+    if (historyList.textContent.includes('Loading session')) {
+      console.log('[loadChatHistory] Skipping update - showing loading state');
+      return;
+    }
+
     // Combine active and historical sessions
     const allSessions = [
       ...(data.active || []).map(s => ({...s, status: 'active'})),
@@ -97,9 +105,17 @@ function enhanceChatInput() {
     }).join('');
 
   } catch (error) {
-    console.error('[loadChatHistoryOnLoad] Error loading chat history:', error);
+    console.error('[loadChatHistory] Error loading chat history:', error);
   }
-})();
+}
+
+// Auto-load chat history when page loads
+if (document.readyState === 'loading') {
+  document.addEventListener('DOMContentLoaded', loadChatHistory);
+} else {
+  // DOM already loaded, load immediately
+  loadChatHistory();
+}
 
 // Resume historical session
 async function resumeSession(sessionId) {