feat(chat): implement pull-to-refresh functionality and pagination for chat history

src/stores/chat/chat-events.ts

@@ -33,6 +33,12 @@ export type ChatEvent =
       output: import("./chat-history-sync").NetworkHistorySyncOutput;
     }
   | { type: "ChatHistoryLoadFailed"; error: unknown }
+  | { type: "ChatLoadMoreHistoryRequested" }
+  | {
+      type: "ChatOlderHistoryLoaded";
+      output: import("./machine/actors/history").LoadMoreHistoryOutput;
+    }
+  | { type: "ChatOlderHistoryLoadFailed"; error: unknown }
   // 业务事件
   | { type: "ChatSendMessage"; content: string }
   | { type: "ChatSendImage"; imageBase64: string }