feat(rss): add full post content to RSS feed

package.json

@@ -15,8 +15,14 @@
     "@tailwindcss/typography": "^0.5.19",
     "@tailwindcss/vite": "^4.1.18",
     "astro": "^5.16.6",
+    "markdown-it": "^14.1.0",
     "mermaid": "^11.12.2",
+    "sanitize-html": "^2.17.0",
     "sharp": "^0.34.5",
     "tailwindcss": "^4.1.18"
+  },
+  "devDependencies": {
+    "@types/markdown-it": "^14.1.2",
+    "@types/sanitize-html": "^2.16.0"
   }
 }

src/pages/rss.xml.ts

@@ -1,6 +1,10 @@
 import rss from '@astrojs/rss';
 import { getCollection } from 'astro:content';
 import type { APIContext } from 'astro';
+import sanitizeHtml from 'sanitize-html';
+import MarkdownIt from 'markdown-it';
+
+const parser = new MarkdownIt();
 
 // Get the date portion in Eastern time and return a Date at noon UTC
 // This ensures the pubDate displays the correct calendar date regardless of timezone
@@ -40,6 +44,9 @@ export async function GET(context: APIContext) {
         description: post.data.description || '',
         link: `/${slug}/`,
         categories: post.data.categories,
+        content: sanitizeHtml(parser.render(post.body ?? ''), {
+          allowedTags: sanitizeHtml.defaults.allowedTags.concat(['img']),
+        }),
       };
 
       if (post.data.image) {