feat: improve mobile header and layout responsiveness

- Add sticky positioning to mobile header
- Implement back navigation for mobile header
- Adjust layout to use min-height instead of fixed height
- Remove global scroll-smooth class for more flexible scrolling
- Update dependencies to latest versions

package.json

@@ -21,12 +21,12 @@
     "@astrojs/sitemap": "^3.2.1",
     "@rehype-pretty/transformers": "^0.13.2",
     "@unocss/reset": "^65.4.3",
-    "astro": "^5.2.5",
+    "astro": "^5.3.0",
     "astro-compress": "^2.3.6",
     "astro-robots-txt": "^1.0.0",
     "hastscript": "^9.0.0",
     "markdown-it": "^14.1.0",
-    "overlayscrollbars": "^2.10.1",
+    "overlayscrollbars": "^2.11.0",
     "photoswipe": "^5.4.4",
     "rehype-autolink-headings": "^7.1.0",
     "rehype-components": "^0.3.0",
@@ -48,7 +48,7 @@
     "@antfu/eslint-config": "^4.2.0",
     "@types/markdown-it": "^14.1.2",
     "@types/mdast": "^4.0.4",
-    "@types/node": "^22.13.1",
+    "@types/node": "^22.13.4",
     "@types/sanitize-html": "^2.13.0",
     "@unocss/eslint-plugin": "^65.4.3",
     "@unocss/preset-attributify": "^65.4.3",