Studies: add a cover image setting, used as the backdrop of the featured study card on the homepage; v2.36.0

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "siteforge",
-  "version": "2.35.0",
+  "version": "2.36.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "siteforge",
-      "version": "2.35.0",
+      "version": "2.36.0",
       "dependencies": {
         "@aws-sdk/client-s3": "^3.1135.0",
         "@dnd-kit/core": "^6.3.1",