fix(chat): stabilize history pagination and message keys

src/types/electron.d.ts

@@ -183,12 +183,14 @@ export interface ElectronAPI {
       success: boolean;
       messages?: Message[];
       hasMore?: boolean;
+      nextOffset?: number;
       error?: string
     }>
     getLatestMessages: (sessionId: string, limit?: number) => Promise<{
       success: boolean
       messages?: Message[]
       hasMore?: boolean
+      nextOffset?: number
       error?: string
     }>
     getNewMessages: (sessionId: string, minTime: number, limit?: number) => Promise<{

src/types/models.ts

@@ -41,6 +41,7 @@ export interface ContactInfo {
 
 // 消息
 export interface Message {
+  messageKey: string
   localId: number
   serverId: number
   localType: number
@@ -105,6 +106,7 @@ export interface Message {
   // 聊天记录
   chatRecordTitle?: string  // 聊天记录标题
   chatRecordList?: ChatRecordItem[]  // 聊天记录列表
+  _db_path?: string
 }
 
 // 聊天记录项