tests + version bump: group chat surface

Extends chat.test.js to cover the new conversation shape (kind/key
fields), the /api/chat/rooms endpoint, the thread-settings
round-trip, and the group-creation pick-view toggle. Room-info view
DOM is structurally checked. Bumps to 1.9.4.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

config.php

@@ -1,7 +1,7 @@
 <?php
 
 define('APP_NAME', 'hyprcrd');
-define('APP_VERSION', '1.9.3');
+define('APP_VERSION', '1.9.4');
 
 // Database path — writable directory, outside webroot
 // DB_PATH / UPLOAD_DIR can be pre-defined by the Electron router for app isolation