Discussion stays open for finished studies; only planned studies are closed; v2.11.2

A finished study is just no longer the main study, so students who take it later still need discussion.

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

package.json

@@ -1,7 +1,7 @@
 {
   "name": "siteforge",
   "private": true,
-  "version": "2.11.1",
+  "version": "2.11.2",
   "type": "module",
   "scripts": {
     "dev": "vite",