重构 Agent 聊天，支持分支管理与消息克隆

src/components/chat/GlobalChatbox.utils.ts

@@ -1,4 +1,4 @@
-import type { PersistedChatState } from "./GlobalChatbox.types";
+import type { BranchGroup, Message, PersistedChatState } from "./GlobalChatbox.types";
 
 export const createId = () =>
   `${Date.now()}-${Math.random().toString(36).slice(2, 8)}`;
@@ -42,7 +42,11 @@ export const getInitialChatState = (): PersistedChatState => {
       window.localStorage.removeItem(CHAT_STORAGE_KEY);
       return { messages: [], sessionId: undefined };
     }
-    return { messages: parsed.messages, sessionId: parsed.sessionId };
+    return {
+      messages: Array.isArray(parsed.messages) ? parsed.messages : [],
+      sessionId: parsed.sessionId,
+      branchGroups: Array.isArray(parsed.branchGroups) ? parsed.branchGroups : [],
+    };
   } catch (error) {
     console.error(
       "[GlobalChatbox] Failed to read persisted chat state:",
@@ -52,3 +56,20 @@ export const getInitialChatState = (): PersistedChatState => {
     return { messages: [], sessionId: undefined };
   }
 };
+
+export const cloneMessage = (message: Message): Message => ({
+  ...message,
+  progress: message.progress ? [...message.progress] : undefined,
+  artifacts: message.artifacts ? [...message.artifacts] : undefined,
+});
+
+export const cloneMessages = (messages: Message[]) => messages.map(cloneMessage);
+
+export const cloneBranchGroups = (branchGroups: BranchGroup[]) =>
+  branchGroups.map((group) => ({
+    ...group,
+    branches: group.branches.map((branch) => ({
+      ...branch,
+      messages: cloneMessages(branch.messages),
+    })),
+  }));