feat: add dark mode logos for selected chains and tokens (#1394)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: paulbalaji

.changeset/dark-logos-added.md

@@ -0,0 +1,5 @@
+---
+'@hyperlane-xyz/registry': patch
+---
+
+Add dark mode logos for chains and tokens