feat(gtm): Implement Rich Session Browser UI

- Replaced the basic session list with a dedicated, card-based Session Browser page.
- Each session card now displays product name, category, description, and a thumbnail placeholder for better usability.
- Updated the backend DB manager to extract this rich information from the existing JSON data store.
- Refactored the frontend (App.tsx, types.ts) to support the new UI and data structure.
- Added new component SessionBrowser.tsx and its corresponding CSS.
- Updated documentation to reflect the v2.6 changes.

gtm_db_manager.py

@@ -94,11 +94,33 @@ def get_project_data(project_id):
             conn.close()
 
 def get_all_projects():
-    """Lists all projects."""
+    """Lists all projects with key details extracted from the JSON data."""
     conn = get_db_connection()
     try:
-        projects = conn.execute('SELECT id, name, created_at, updated_at FROM gtm_projects ORDER BY updated_at DESC').fetchall()
-        return [dict(ix) for ix in projects]
+        query = """
+            SELECT 
+                id, 
+                name, 
+                updated_at,
+                json_extract(data, '$.phases.phase1_result.specs.metadata.model_name') AS productName,
+                json_extract(data, '$.phases.phase1_result.specs.metadata.category') AS productCategory,
+                json_extract(data, '$.phases.phase1_result.specs.metadata.description') AS productDescription
+            FROM gtm_projects 
+            ORDER BY updated_at DESC
+        """
+        projects = conn.execute(query).fetchall()
+        # Convert row objects to dictionaries, handling potential None values
+        project_list = []
+        for row in projects:
+            project_dict = dict(row)
+            if project_dict.get('productName') is None:
+                project_dict['productName'] = project_dict['name'] # Fallback to project name
+            if project_dict.get('productCategory') is None:
+                project_dict['productCategory'] = "Uncategorized" # Default category
+            if project_dict.get('productDescription') is None:
+                project_dict['productDescription'] = "No description available." # Default description
+            project_list.append(project_dict)
+        return project_list
     finally:
         if conn:
             conn.close()