feat: 为 desktop/server 添加 Tailwind CSS 支持和 Biome 集成

- desktop renderer 接入 @tailwindcss/vite，loading 页面改用 Tailwind 类
- 两个 app 添加 biome.json 继承配置：tailwindDirectives + useSortedClasses

bun.lock

@@ -15,10 +15,12 @@
       "version": "1.0.0",
       "devDependencies": {
         "@furtherverse/tsconfig": "workspace:*",
+        "@tailwindcss/vite": "catalog:",
         "@types/node": "catalog:",
         "electron": "catalog:",
         "electron-builder": "catalog:",
         "electron-vite": "catalog:",
+        "tailwindcss": "catalog:",
       },
     },
     "apps/server": {