help: let the dialog scroll

The shared modal-container rule slapped `overflow: hidden` on
`#help > div` to clip border-radius, which won over the Tailwind
`overflow-y-auto` on the same element and froze the scroll. Move
help to its own rule that keeps the rounded corners + shadow and
leaves overflow alone so the inline overflow-y-auto takes effect.

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', '1.9.13');
+define('APP_VERSION', '1.9.14');
 
 // Database path — writable directory, outside webroot
 // DB_PATH / UPLOAD_DIR can be pre-defined by the Electron router for app isolation