fix(deps): upgrade vite v8 and @vitejs/plugin-react v6

plugin-react v6 requires Vite v8's built-in Oxc integration.
Must co-upgrade since plugin-react v6 dropped Vite 7 support.

Author: wpfleger96

desktop/package.json

@@ -76,13 +76,13 @@
     "@tauri-apps/cli": "~2.11",
     "@types/react": "^19.1.8",
     "@types/react-dom": "^19.1.6",
-    "@vitejs/plugin-react": "^4.6.0",
+    "@vitejs/plugin-react": "^6.0.0",
     "autoprefixer": "^10.4.27",
     "nostr-tools": "^2.23.3",
     "postcss": "^8.5.8",
     "tailwindcss": "^3.4.17",
     "tailwindcss-animate": "^1.0.7",
     "typescript": "~5.9.0",
-    "vite": "^7.0.4"
+    "vite": "^8.0.0"
   }
 }