fix: install exact prettier dev dependency

CI keeps changing prettier's SCSS formatting. Specify the exact version of prettier that it was first installed with, to maintain a consistent style. Previously, it was only installed as a transitive dependency.

package.json

@@ -26,9 +26,10 @@
   },
   "devDependencies": {
     "laravel-vite-plugin": "^1.1.1",
-    "vite-plugin-static-copy": "^2.2.0",
+    "prettier": "3.3.3",
     "prettier-plugin-blade": "2.0.0",
-    "vite": "^6.0.6"
+    "vite": "^6.0.6",
+    "vite-plugin-static-copy": "^2.2.0"
   },
   "type": "module"
 }