fix: persist DA included height in syncer for full nodes

Full nodes syncing from DA were not persisting the DAIncludedHeightKey
metadata, causing the E2E test to fail when querying this value.

The submitter (sequencer) already persists this key when verifying DA
inclusion. This change adds the same logic to the syncer so full nodes
also track which blocks have been DA included.

Author: randygrok

block/internal/syncing/syncer.go

@@ -464,6 +464,13 @@ func (s *Syncer) processHeightEvent(event *common.DAHeightEvent) {
 
 	// only save to p2p stores if the event came from DA
 	if event.Source == common.SourceDA {
+		// Persist DA included height for full nodes syncing from DA
+		bz := make([]byte, 8)
+		binary.LittleEndian.PutUint64(bz, height)
+		if err := s.store.SetMetadata(s.ctx, store.DAIncludedHeightKey, bz); err != nil {
+			s.logger.Error().Err(err).Uint64("height", height).Msg("failed to persist DA included height")
+		}
+
 		g, ctx := errgroup.WithContext(s.ctx)
 		g.Go(func() error {
 			// broadcast header locally only — prevents spamming the p2p network with old height notifications,