refac

src/lib/components/chat/Chat.svelte

@@ -58,6 +58,7 @@
 		copyToClipboard,
 		getMessageContentParts,
 		createMessagesList,
+		sanitizeHistory,
 		getPromptVariables,
 		processDetails,
 		removeAllDetails,
@@ -1379,29 +1380,9 @@
 						? chatContent.history
 						: convertMessagesToHistory(chatContent.messages);
 
-				// Sanitize history: repair orphaned references from failed regenerations (#24424)
-				for (const message of Object.values(history.messages)) {
-					if (message.childrenIds) {
-						message.childrenIds = message.childrenIds.filter(
-							(childId) => history.messages[childId]
-						);
-					}
-				}
-				if (history.currentId && !history.messages[history.currentId]) {
-					const messageIds = Object.keys(history.messages);
-					let lastMessageId = null;
-					for (const messageId of messageIds) {
-						const message = history.messages[messageId];
-						if (
-							(message.childrenIds ?? []).length === 0 &&
-							(!lastMessageId ||
-								(message.timestamp ?? 0) > (history.messages[lastMessageId].timestamp ?? 0))
-						) {
-							lastMessageId = messageId;
-						}
-					}
-					history.currentId = lastMessageId ?? messageIds[0] ?? null;
-				}
+				// Sanitize history: repair orphaned references and structurally-malformed
+				// nodes from failed regenerations (#24424, #24157, #20474)
+				sanitizeHistory(history);
 
 				chatTitle.set(chatContent.title);