fix(chat): make group-chat author labels readable

Author name above group bubbles was 8px dim-grey pixel font — visible
in theory, invisible in practice. Bump to 10px semibold accent,
left-aligned above the incoming bubble it labels.

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', '1.9.4');
+define('APP_VERSION', '1.9.5');
 
 // Database path — writable directory, outside webroot
 // DB_PATH / UPLOAD_DIR can be pre-defined by the Electron router for app isolation