chore: remove unused dependencies, enhance scrollbar functionality, and update VSCode settings

- Removed unused `@types/mdast` dependency from package.json and pnpm-lock.yaml.
- Introduced a custom scrollbar component with theme support in Scrollbar.astro.
- Updated Layout.astro to include the new Scrollbar component.
- Enhanced ThemeToggle.astro to dispatch a theme-changed event on toggle.
- Added global scrollbar styles to global.css and created a new scrollbar.css for custom scrollbar styling.
- Updated VSCode settings to improve editor experience and added recommendations for new extensions.

.vscode/extensions.json

@@ -1,4 +1,8 @@
 {
-  "recommendations": ["astro-build.astro-vscode"],
+  "recommendations": [
+    "astro-build.astro-vscode",
+    "antfu.unocss",
+    "biomejs.biome"
+  ],
   "unwantedRecommendations": []
 }

.vscode/settings.json

@@ -1,12 +1,50 @@
 {
+  "[markdown]": {
+    "editor.quickSuggestions": {
+      "comments": "on",
+      "other": "on",
+      "strings": "on"
+    }
+  },
+  "prettier.enable": false,
   "editor.formatOnSave": false,
   "editor.codeActionsOnSave": {
-    "source.fixAll.eslint": "explicit"
+    "source.fixAll.eslint": "explicit",
+    "source.organizeImports": "never"
   },
+  "eslint.rules.customizations": [
+    { "rule": "style/*", "severity": "off", "fixable": true },
+    { "rule": "format/*", "severity": "off", "fixable": true },
+    { "rule": "*-indent", "severity": "off", "fixable": true },
+    { "rule": "*-spacing", "severity": "off", "fixable": true },
+    { "rule": "*-spaces", "severity": "off", "fixable": true },
+    { "rule": "*-order", "severity": "off", "fixable": true },
+    { "rule": "*-dangle", "severity": "off", "fixable": true },
+    { "rule": "*-newline", "severity": "off", "fixable": true },
+    { "rule": "*quotes", "severity": "off", "fixable": true },
+    { "rule": "*semi", "severity": "off", "fixable": true }
+  ],
   "eslint.validate": [
     "javascript",
+    "javascriptreact",
     "typescript",
-    "astro"
+    "typescriptreact",
+    "vue",
+    "html",
+    "markdown",
+    "json",
+    "jsonc",
+    "yaml",
+    "toml",
+    "xml",
+    "gql",
+    "graphql",
+    "astro",
+    "css",
+    "less",
+    "scss",
+    "pcss",
+    "postcss"
   ],
   "typescript.tsdk": "node_modules/typescript/lib",
   "files.associations": {