The create, delete, and move cookie mutations were not updating
the Relay store connections, so the UI only reflected changes
after a page reload. Add @connection and @appendEdge/@deleteEdge
directives, and a store updater for the move mutation.
Also document mutation store update rules in contrib/claude/relay.md.
Signed-off-by: Émile Ré <emile@getprobo.com>
8e420da5bc