Apply master-detail pattern to Ep. Highlights and Download Library; v1.1.52

Episode Highlights and the Downloads Library section now use the same compact
list → click to edit pattern as Studies. Both sections show a scannable row
list (title, key meta, edit/delete buttons) and open a focused editor for a
single item. Testimonials and Finished Books remain as collapsible cards since
they have few fields and grow slowly.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

package.json

@@ -1,7 +1,7 @@
 {
   "name": "siteforge",
   "private": true,
-  "version": "1.1.51",
+  "version": "1.1.52",
   "type": "module",
   "scripts": {
     "dev": "vite",