bump(deps): Upgrade Vite to ^6.4.2 (#255)

Bump vite in package.json from ^5.4.19 to ^6.4.2 and update pnpm-lock.yaml to reflect the resulting dependency changes. Run pnpm install and verify build/Storybook tasks for compatibility with the new Vite release.

Author: nathanyoung

package.json

@@ -142,7 +142,7 @@
     "tsup": "^8.0.0",
     "typescript": "^5.9.3",
     "url-loader": "^4.1.1",
-    "vite": "^5.4.19",
+    "vite": "^6.4.2",
     "webpack": "^5.94.0",
     "webpack-cli": "^5.1.4",
     "webpack-fix-style-only-entries": "^0.6.1"