Fix project isolation: Make loadChatHistory respect active project sessions

- Modified loadChatHistory() to check for active project before fetching all sessions
- When active project exists, use project.sessions instead of fetching from API
- Added detailed console logging to debug session filtering
- This prevents ALL sessions from appearing in every project's sidebar

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

public/claude-ide/index.html

@@ -426,7 +426,12 @@
                 <div class="chat-sidebar-overlay" id="chat-sidebar-overlay"></div>
                 <div class="chat-sidebar" id="chat-sidebar">
                     <div class="sidebar-header">
-                        <h2>Chat</h2>
+                        <div class="sidebar-header-archives">
+                            <h2>Chat</h2>
+                            <button class="btn-show-archives" onclick="showArchivedSessions()" title="View archived sessions">
+                                📦 Archives
+                            </button>
+                        </div>
                         <button class="btn-primary" onclick="startNewChat()">+ New</button>
                     </div>
                     <div class="chat-history-list" id="chat-history-list">
@@ -506,6 +511,11 @@
             </div>
         </div>
 
+        <!-- Merge Sessions Button (shows when 2+ sessions selected) -->
+        <button id="merge-sessions-btn" onclick="mergeSessions()" style="display: none;">
+            🔀 Emerge Sessions
+        </button>
+
         <!-- Files View -->
         <div id="files-view" class="view">
             <div class="files-layout">