fix: sticky header regression (#5869)

* fix: sticky header regression

* fix: github release changelog format for app release workflow

* fix: lint

.github/workflows/theseus-release.yml

@@ -55,76 +55,7 @@ jobs:
       - name: 📝 Extract app changelog
         env:
           VERSION: ${{ env.VERSION_TAG }}
-        run: |
-          node <<'EOF'
-          const fs = require('fs');
-          const version = process.env.VERSION.replace(/^v/, '');
-          const src = fs.readFileSync('packages/blog/changelog.ts', 'utf8');
-
-          // Parse every entry in the VERSIONS array, preserving their order
-          // (which is reverse chronological).
-          const entryRe = /\{\s*date:\s*`([^`]+)`,\s*product:\s*'(\w+)',(?:\s*version:\s*[`']([^`']+)[`'],)?\s*body:\s*`([\s\S]*?)`,\s*\}/g;
-          const entries = [];
-          let match;
-          while ((match = entryRe.exec(src)) !== null) {
-            entries.push({
-              date: match[1],
-              product: match[2],
-              version: match[3],
-              body: match[4],
-            });
-          }
-
-          const currentIdx = entries.findIndex(
-            (e) => e.product === 'app' && e.version === version,
-          );
-          if (currentIdx === -1) {
-            console.error(`No app changelog entry found for version ${version}`);
-            process.exit(1);
-          }
-
-          // Find the surrounding app entries so we can scope hosting changes to
-          // exactly what shipped between the previous app release and this one.
-          // Entries are in reverse chronological order, so newer entries have
-          // smaller indices than older entries.
-          let newerAppIdx = -1;
-          for (let i = currentIdx - 1; i >= 0; i--) {
-            if (entries[i].product === 'app') {
-              newerAppIdx = i;
-              break;
-            }
-          }
-          let previousAppIdx = entries.length;
-          for (let i = currentIdx + 1; i < entries.length; i++) {
-            if (entries[i].product === 'app') {
-              previousAppIdx = i;
-              break;
-            }
-          }
-
-          const hostingEntries = [];
-          for (let i = newerAppIdx + 1; i < previousAppIdx; i++) {
-            if (entries[i].product === 'hosting') {
-              hostingEntries.push(entries[i]);
-            }
-          }
-
-          let output = entries[currentIdx].body;
-          if (hostingEntries.length > 0) {
-            // Demote any top-level section headings inside hosting bodies so
-            // they nest cleanly under the "Modrinth Hosting (included)" header.
-            const demoteHeadings = (body) =>
-              body.replace(/^(#{1,5})\s/gm, (_, hashes) => `${hashes}# `);
-            const hostingBody = hostingEntries
-              .map((e) => demoteHeadings(e.body))
-              .join('\n\n');
-            output += `\n\n---\n\n## Modrinth Hosting (included)\n\n${hostingBody}`;
-          }
-
-          fs.writeFileSync('release-notes.md', output);
-          console.log(`Extracted changelog for app ${version}:`);
-          console.log(output);
-          EOF
+        run: npx --yes tsx scripts/build-theseus-release-notes.ts
 
       - name: 🛠️ Generate version manifest
         run: |