fix(pdf-server): remove page-loading overlay (#493)

* fix(pdf-server): remove page-loading overlay

The overlay had multiple issues:
- Hardcoded white background broke dark mode
- Could get stuck visible, breaking sizing/layout
- Added little value since previous page stays visible during render
  and the 150ms delay meant most renders completed before it showed

* prettier:fix

package-lock.json

@@ -527,6 +527,9 @@
         "@modelcontextprotocol/sdk": "^1.24.0",
         "zod": "^4.1.13"
       },
+      "bin": {
+        "mcp-server-debug": "dist/index.js"
+      },
       "devDependencies": {
         "@types/cors": "^2.8.19",
         "@types/express": "^5.0.0",