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-lock.json

@@ -33,7 +33,7 @@
         "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",
@@ -7179,9 +7179,9 @@
       }
     },
     "node_modules/folds": {
-      "version": "2.5.0",
-      "resolved": "https://registry.npmjs.org/folds/-/folds-2.5.0.tgz",
-      "integrity": "sha512-UJhvXAQ1XnZ9w10KJwSW+frvzzWE/zcF0dH3fDVCD70RFHAxwEi0UkkVS8CaZGxZF2Wvt3qTJyTS5LW3LwwUAw==",
+      "version": "2.6.0",
+      "resolved": "https://registry.npmjs.org/folds/-/folds-2.6.0.tgz",
+      "integrity": "sha512-9353l0KFBptqUXYBJhoZ0ZEs7ofLUeSmcZEtzn23IbAM1SG7R3tTQTk24lcLKJu95qMGxuC3no8MQTQExNHUNw==",
       "license": "Apache-2.0",
       "peerDependencies": {
         "@vanilla-extract/css": "1.9.2",