fix: Use correct API method addObject instead of addText

MCP server was calling non-existent addText() method.
Changed to addObject({type: "text", ...}) which is the correct API.

This should finally allow text to be added when customizing layouts.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <[email protected]>

mcp_server_comprehensive.py

@@ -447,13 +447,16 @@ async def create_thumbnail(inputs: Dict[str, Any]) -> Dict[str, Any]:
                 # Add new title text
                 if title_objects:
                     first_title = title_objects[0]
-                    await execute_api_call(page, "addText", title, {
+                    await execute_api_call(page, "addObject", {
+                        "type": "text",
+                        "text": title,
                         "x": first_title.get("x", 73),
                         "y": first_title.get("y", 65),
                         "fontSize": first_title.get("fontSize", 190),
                         "fontFamily": first_title.get("fontFamily", "Inter"),
                         "fill": first_title.get("fill", "#000000"),
-                        "fontWeight": "bold"
+                        "fontWeight": "bold",
+                        "bold": True
                     })
                     results.append({"step": "add_new_title"})
                     # Wait for new text to render
@@ -490,7 +493,9 @@ async def create_thumbnail(inputs: Dict[str, Any]) -> Dict[str, Any]:
                 # Add new subtitle text
                 if subtitle_objects:
                     first_subtitle = subtitle_objects[0]
-                    await execute_api_call(page, "addText", subtitle, {
+                    await execute_api_call(page, "addObject", {
+                        "type": "text",
+                        "text": subtitle,
                         "x": first_subtitle.get("x", 84),
                         "y": first_subtitle.get("y", 428),
                         "fontSize": first_subtitle.get("fontSize", 68),