media/loader: article slug from folder; _index.md loads as article; _ dirs ignored; slugs lowercased

app/src/content.go

@@ -186,17 +186,20 @@ func (c *Content) loadFilesUnder(dir string, out *[]*Article) error {
 	}
 	for _, e := range entries {
 		name := e.Name()
-		if strings.HasPrefix(name, "_") {
-			continue
-		}
 		if e.IsDir() {
-			// recurse one level (article folder) — skip hidden
+			// recurse one level (article folder) — skip hidden/_ folders (e.g. _attachments)
+			if !strings.HasPrefix(name, "_") {
 				c.loadFilesUnder(path.Join(dir, name), out)
+			}
 			continue
 		}
 		if !strings.HasSuffix(name, ".md") {
 			continue
 		}
+		// skip _ files (config, templates) BUT _index.md is the real article in a folder
+		if strings.HasPrefix(name, "_") && name != "_index.md" {
+			continue
+		}
 		if a, err := c.loadFile(path.Join(dir, name)); err == nil {
 			// unpublished articles are drafts — load, then hide from all listings
 			*out = append(*out, a)
@@ -338,7 +341,13 @@ func parseFrontMatter(text string) (FrontMatter, string, bool) {
 func slugOf(full string) string {
 	base := path.Base(full)
 	base = strings.TrimSuffix(base, ".md")
-	return base
+	// article files are now <folder>/_index.md — the slug is the folder name.
+	if base == "_index" {
+		dir := path.Dir(full)
+		base = path.Base(dir)
+	}
+	// lowercase for URL-friendly slugs
+	return strings.ToLower(base)
 }
 
 // resolveShortcodes replaces {{media:name}} with base/name and