Thumbnails: prefer *_thumb child note, fallback to first image; round embedded images and inline code; theme figcaptions

blog_generator.js

@@ -101,7 +101,11 @@ function run() {
         return SHARE_BASE + "/" + encodeURIComponent("tag-" + slugifyTag(t));
     }
 
-    function firstImageSrc(a) {
+    function thumbSrc(a) {
+        try {
+            const thumbs = (a.getChildNotes() || []).filter(n => /_thumb\.[A-Za-z0-9]+$/i.test(n.title));
+            if (thumbs.length) return "api/notes/" + thumbs[0].noteId + "/download";
+        } catch (e) {}
         try {
             const m = String(a.getContent() || "").match(/<img[^>]+src="([^"]+)"/);
             return m ? m[1] : "";
@@ -118,7 +122,7 @@ function run() {
             const summary = a.getLabelValue("summary") || "";
             const link = `${SHARE_BASE}/${encodeURIComponent(a.getLabelValue("shareAlias") || a.noteId)}`;
             const tags = tagList(a);
-            const thumb = firstImageSrc(a);
+            const thumb = thumbSrc(a);
 
             lines.push('<article class="blog-post">');
             lines.push('  <header class="blog-post-header">');