Migrate UI to Lucide icons, reorder sidebar, and polish journal/groups UX

- Replace emoji icons with Lucide across admin pages; add vendor/lucide.min.js and renderIcons() helper\n- Reorder sidebar logically (Dashboard, Journal, Students, Groups, Files, Links, Trash + admin sections)\n- Groups: open photo chronology only via the Фото button; covers no longer clickable\n- Journal: show group badge over card photo, compact AI-status icon beside description, and date range in empty-state message\n- Update README (AI worker, Lucide, worker.js)

package.json

@@ -6,14 +6,15 @@
     "start": "node server.js"
   },
   "dependencies": {
+    "bcrypt": "^5.1.1",
     "express": "^4.21.0",
     "express-rate-limit": "^8.7.0",
+    "heic-convert": "^2.1.0",
     "helmet": "^8.3.0",
+    "lucide": "^1.44.0",
     "multer": "^1.4.5-lts.1",
     "pg": "^8.13.0",
-    "tar": "^7.4.3",
-    "bcrypt": "^5.1.1",
-    "heic-convert": "^2.1.0"
+    "tar": "^7.4.3"
   },
   "allowScripts": {
     "bcrypt@5.1.1": true