refactor: refine folder structure and rename

frontend/src/core/threads/index.ts

@@ -0,0 +1 @@
+export * from "./types";

frontend/src/core/threads/types.ts

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+import { type BaseMessage } from "@langchain/core/messages";
+import type { Thread } from "@langchain/langgraph-sdk";
+
+export interface AgentThreadState extends Record<string, unknown> {
+  title: string;
+  messages: BaseMessage[];
+}
+
+export interface AgentThread extends Thread<AgentThreadState> {}
+
+export interface AgentThreadContext extends Record<string, unknown> {
+  thread_id: string;
+  model: string;
+  thinking_enabled: boolean;
+}

frontend/src/core/threads/utils.ts

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+import type { BaseMessage } from "@langchain/core/messages";
+
+import type { AgentThread } from "./types";
+
+export function pathOfThread(thread: AgentThread, includeAssistantId = true) {
+  if (includeAssistantId) {
+    return `/workspace/chats/${thread.thread_id}`;
+  }
+  return `/workspace/chats/${thread.thread_id}`;
+}
+
+export function textOfMessage(message: BaseMessage) {
+  if (typeof message.content === "string") {
+    return message.content;
+  } else if (Array.isArray(message.content)) {
+    return message.content.find((part) => part.type === "text" && part.text)
+      ?.text as string;
+  }
+  return null;
+}
+
+export function titleOfThread(thread: AgentThread) {
+  if (thread.values && "title" in thread.values) {
+    return thread.values.title;
+  }
+  return "Untitled";
+}