chore: optimize head component

- Add dynamic theme-color meta tag based on current theme mode
- Preload custom font files for improved performance
- Update ClientRouter configuration for view transitions
- Refactor theme toggle script comments for clarity

package.json

@@ -44,21 +44,21 @@
     "vite": "^6.1.0"
   },
   "devDependencies": {
-    "@antfu/eslint-config": "^4.2.1",
+    "@antfu/eslint-config": "^4.3.0",
     "@types/markdown-it": "^14.1.2",
     "@types/mdast": "^4.0.4",
     "@types/node": "^22.13.4",
     "@types/sanitize-html": "^2.13.0",
-    "@unocss/eslint-plugin": "^65.5.0",
-    "@unocss/preset-attributify": "^65.5.0",
-    "@unocss/reset": "^65.5.0",
+    "@unocss/eslint-plugin": "^66.0.0",
+    "@unocss/preset-attributify": "^66.0.0",
+    "@unocss/reset": "^66.0.0",
     "astro-eslint-parser": "^1.2.1",
     "eslint": "^9.20.1",
     "eslint-plugin-astro": "^1.3.1",
     "lint-staged": "^15.4.3",
     "mdast-util-to-string": "^4.0.0",
     "reading-time": "^1.5.0",
-    "unocss": "^65.5.0",
+    "unocss": "^66.0.0",
     "unocss-preset-theme": "^0.14.1"
   },
   "lint-staged": {