refactor: unify join rule icon mapping and update call/space icons

- bump folds from 2.5.0 to 2.6.0
- replace separate room/space join-rule icon hooks with useJoinRuleIcons(roomType)
- route join-rule icons through getRoomIconSrc for consistent room type handling
- simplify getRoomIconSrc by removing the locked override path
- use VolumeHighGlobe for public call rooms and VolumeHighLock for private call rooms

package.json

@@ -45,7 +45,7 @@
     "emojibase-data": "15.3.2",
     "file-saver": "2.0.5",
     "focus-trap-react": "10.0.2",
-    "folds": "2.5.0",
+    "folds": "2.6.0",
     "html-dom-parser": "4.0.0",
     "html-react-parser": "4.2.0",
     "i18next": "23.12.2",