Upgrade Vite from 4 to 6 and @vitejs/plugin-vue from 4 to 5

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package.json

@@ -54,7 +54,7 @@
     "@types/node": "^20.14.10",
     "@types/vue": "^2.0.0",
     "@types/vue-router": "^2.0.0",
-    "@vitejs/plugin-vue": "^4.0.0",
+    "@vitejs/plugin-vue": "^5.2.4",
     "@vue/eslint-config-prettier": "^7.0.0",
     "@vue/test-utils": "^2.4.6",
     "autoprefixer": "^10.4.27",
@@ -71,7 +71,7 @@
     "tailwindcss": "^3.2.4",
     "ts-node": "^10.9.2",
     "typescript": "^5.9.3",
-    "vite": "^4.0.0",
+    "vite": "^6.4.1",
     "vitest": "^0.25.6"
   }
 }