feat(chat): unlock history after payment

src/stores/chat/chat-context.tsx

@@ -30,6 +30,10 @@ interface ChatState {
   historyOffset: number;
   /** history 初始加载完成标志（local → network → save 跑完） —— UI 可用此显示 loading */
   historyLoaded: boolean;
+  unlockHistoryPromptVisible: boolean;
+  lockedHistoryCount: number;
+  isUnlockingHistory: boolean;
+  unlockHistoryError: string | null;
 }
 
 const ChatStateCtx = createContext<ChatState | null>(null);
@@ -55,6 +59,10 @@ export function ChatProvider({ children }: ChatProviderProps) {
       hasMore: state.context.hasMore,
       historyOffset: state.context.historyOffset,
       historyLoaded: state.context.historyLoaded,
+      unlockHistoryPromptVisible: state.context.unlockHistoryPromptVisible,
+      lockedHistoryCount: state.context.lockedHistoryCount,
+      isUnlockingHistory: state.context.isUnlockingHistory,
+      unlockHistoryError: state.context.unlockHistoryError,
     }),
     [state],
   );