core, trie: flush preimages to db on blockchain close (#25533)

* core, trie: flush preimages to db on database close

Co-authored-by: rjl493456442 <garyrong0905@gmail.com>

* rename Close to CommitPreimages for clarity

* core, trie: nitpick fixes

Co-authored-by: rjl493456442 <garyrong0905@gmail.com>
Co-authored-by: Péter Szilágyi <peterke@gmail.com>

core/blockchain.go

@@ -893,6 +893,10 @@ func (bc *BlockChain) Stop() {
 			log.Error("Dangling trie nodes after full cleanup")
 		}
 	}
+	// Flush the collected preimages to disk
+	if err := bc.stateCache.TrieDB().CommitPreimages(); err != nil {
+		log.Error("Failed to commit trie preimages", "err", err)
+	}
 	// Ensure all live cached entries be saved into disk, so that we can skip
 	// cache warmup when node restarts.
 	if bc.cacheConfig.TrieCleanJournal != "" {