feat: enhance modal image handling and SEO improvements

- Optimized modal image dimensions for better responsiveness
- Ensured modal images maintain aspect ratio and scale appropriately
- Added eager loading for header images to improve initial load performance
- Corrected GitHub link title typo for SEO accuracy
- Enhanced post content handling by normalizing emoji styles and search link paths
- Improved cache key management for channel info requests to include type and ID
- Streamlined channel info fetching logic for efficiency
- Updated breadcrumb image handling to support static proxy and void file fallback

src/components/item.astro

@@ -174,4 +174,12 @@ const timeago = datetime.isBefore(dayjs().subtract(1, 'w'))
       background-size: cover;
     }
   }
+
+  .content :global(.emoji) {
+    font-style: normal;
+  }
+
+  .tag-box {
+    flex-wrap: wrap;
+  }
 </style>