When using the default AI snapshot format without explicit options like
interactive/compact/labels, refs were not being registered because
snapshotAiViaPlaywright returns raw text without ref registration.
This caused 'Unknown ref' errors when subsequently using act commands
with refs like e12 that appeared in the snapshot text.
The fix extracts refs from the AI snapshot using buildRoleSnapshotFromAiSnapshot
and registers them via rememberRoleRefsForTarget so act commands can resolve them.
Fixes#1268
