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/ide.css

@@ -623,6 +623,7 @@ body {
   display: flex;
   flex-direction: column;
   overflow: hidden;
+  min-height: 0; /* CRITICAL: Enables proper flex growth for nested flex items */
 }
 
 /* Chat Header */
@@ -632,6 +633,7 @@ body {
   display: flex;
   justify-content: space-between;
   align-items: center;
+  flex-shrink: 0; /* Prevent header from shrinking */
 }
 
 .chat-session-info h2 {
@@ -650,11 +652,13 @@ body {
   gap: 0.5rem;
 }
 
-/* Chat Messages */
+/* Chat Messages - CODENOMAD-INSPIRED: Single-screen layout */
 .chat-messages {
   flex: 1;
+  min-height: 0; /* CRITICAL: Allows flex item to shrink below content size */
   overflow-y: auto;
   padding: 2rem;
+  scroll-behavior: smooth;
 }
 
 .chat-welcome {
@@ -1219,6 +1223,48 @@ body {
     color: #888;
 }
 
+/* Session Close Button - Always visible but subtle */
+.session-close-btn {
+    position: absolute;
+    top: 12px;
+    right: 12px;
+    width: 28px;
+    height: 28px;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    background: rgba(255, 77, 77, 0.08);
+    border: 1px solid rgba(255, 77, 77, 0.2);
+    border-radius: 6px;
+    color: #ff6b6b;
+    cursor: pointer;
+    opacity: 0.5;
+    transition: all 0.2s ease;
+    font-size: 16px;
+    line-height: 1;
+    z-index: 10;
+}
+
+.session-item {
+    position: relative;
+}
+
+.session-item:hover .session-close-btn {
+    opacity: 1;
+    background: rgba(255, 77, 77, 0.15);
+    border-color: rgba(255, 77, 77, 0.4);
+}
+
+.session-close-btn:hover {
+    background: rgba(255, 77, 77, 0.2);
+    border-color: #ff6b6b;
+    transform: scale(1.1);
+}
+
+.session-close-btn:active {
+    transform: scale(0.95);
+}
+
 /* Empty/Error States */
 .empty-state, .error-state {
     text-align: center;