Fix missing queueStudyUsersWrite import causing crash-restart loop; v1.1.30

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

package.json

@@ -1,7 +1,7 @@
 {
   "name": "siteforge",
   "private": true,
-  "version": "1.1.29",
+  "version": "1.1.30",
   "type": "module",
   "scripts": {
     "dev": "vite",

server/study-helpers.js

@@ -11,7 +11,7 @@ import {
   DEFAULT_REDIRECT_RULES,
 } from './config.js'
 import { state } from './state.js'
-import { queueStudyRemindersWrite } from './data.js'
+import { queueStudyRemindersWrite, queueStudyUsersWrite } from './data.js'
 
 // ── Username / slug normalizers ────────────────────────────────────────────