docs: add server change note for the branches list archive redirect

Co-Authored-By: Claude <noreply@anthropic.com>

Author: claude

.server-changes/archive-branch-keeps-list-page.md

@@ -0,0 +1,6 @@
+---
+area: webapp
+type: fix
+---
+
+Archiving a branch now returns you to the same page of the branches list, keeping your place, search and filters instead of resetting to the first page.