feat(blog): refactor blog components and improve category/tag handling

- Add new CategoryCard and TagCard components to centralize UI logic
- Convert BlogList from React to Astro component
- Improve category and tag matching by using IDs from frontmatter
- Update all blog pages to use new components
- Add line-height to global styles for better readability

src/styles/global.css

@@ -122,6 +122,7 @@
 @layer base {
   * {
     @apply border-border outline-ring/50;
+    line-height: 1.2;
   }
   body {
     @apply bg-background text-foreground;