fix(build): prepare frontend workspace outputs

- Build GUI and web frontend workspace dependencies before Vite starts
- Use relative GUI asset paths for Tauri packaged resources
- Refresh caniuse-lite to remove stale Browserslist warnings

package.json

@@ -3,6 +3,7 @@
   "private": true,
   "pnpm": {
     "overrides": {
+      "caniuse-lite": "1.0.30001791",
       "minimatch": "10.2.4"
     }
   }