- Enhanced skip objects feature with visual improvements and better UX

- Skip Objects Modal:
    - Object ID markers overlaid on preview image (grid layout)
    - Large prominent ID badges to match printer display
    - Info banner explaining to match IDs with printer screen
    - Layer warning when skip unavailable (layer <= 1)
    - Red badge on button showing skipped count
    - Preview image now shown when paused (not just running)
    - Close with ESC key or click outside modal
    - Full light/dark theme support

  - Backend:
    - Extract object positions from 3MF (include_positions=True)
    - API returns x/y coordinates for objects (when available)
    - Parse s_obj from printer MQTT for skipped state persistence
    - Cover URL available in PAUSE/PAUSED states

  - Tests:
    - Added test for objects with position data

static/index.html

@@ -23,8 +23,8 @@
 
     <!-- Splash screens for iOS -->
     <link rel="apple-touch-startup-image" href="/img/android-chrome-512x512.png" />
-    <script type="module" crossorigin src="/assets/index-3UvyJ1HQ.js"></script>
-    <link rel="stylesheet" crossorigin href="/assets/index-BJk0xs4c.css">
+    <script type="module" crossorigin src="/assets/index-Cciht2VR.js"></script>
+    <link rel="stylesheet" crossorigin href="/assets/index-CPQbpodw.css">
   </head>
   <body>
     <div id="root"></div>