feat(ghostty): load optional machine-specific local config

Generated-by: aiautocommit

Author: iloveitaly

.config/ghostty/config

@@ -24,3 +24,6 @@ font-feature = -dlig
 
 split-divider-color = #FFFFFF
 
+# Machine-specific overrides (optional). See config.local / omarchy sync.
+config-file = ?config.local
+