feat: enhance designer canvas with multi-view support and model viewer integration

- Added canvasId prop to DesignerCanvas for identifying multiple canvases.
- Implemented active view selection (front, top, left, right) in designer page.
- Updated DesignerCanvas to maintain aspect ratio and dimensions based on view.
- Integrated @google/model-viewer for 3D model rendering on the index page.
- Refactored useSlipmatDesigner to manage multiple canvases and their states.
- Added LAMESA.glb model file for 3D representation.
- Updated package.json and package-lock.json to include @google/model-viewer dependency.

package.json

@@ -10,7 +10,8 @@
     "postinstall": "nuxt prepare"
   },
   "dependencies": {
-  "@nuxtjs/color-mode": "^3.5.2",
+    "@google/model-viewer": "^4.1.0",
+    "@nuxtjs/color-mode": "^3.5.2",
     "@tailwindcss/vite": "^4.1.16",
     "fabric": "^6.0.2",
     "firebase": "^12.5.0",