feat(chat): unlock history after payment

src/stores/chat/__tests__/chat-machine.helpers.test.ts

@@ -4,6 +4,7 @@ import { ChatSendResponse } from "@/data/dto/chat/chat_send_response";
 import type { ChatState } from "@/stores/chat/chat-state";
 import {
   applyHttpSendOutput,
+  countLockedHistoryMessages,
   localMessagesToUi,
   sendResponseToUiMessage,
 } from "@/stores/chat/chat-machine.helpers";
@@ -43,6 +44,11 @@ function makeChatState(overrides: Partial<ChatState> = {}): ChatState {
     hasMore: true,
     historyOffset: 0,
     historyLoaded: true,
+    paymentUnlockPending: false,
+    unlockHistoryPromptVisible: false,
+    lockedHistoryCount: 0,
+    isUnlockingHistory: false,
+    unlockHistoryError: null,
     ...overrides,
   };
 }
@@ -231,3 +237,40 @@ describe("localMessagesToUi", () => {
     expect(message.imagePaywalled).toBeUndefined();
   });
 });
+
+describe("countLockedHistoryMessages", () => {
+  it("counts only unlockable locked AI messages", () => {
+    expect(
+      countLockedHistoryMessages([
+        {
+          content: "",
+          isFromAI: true,
+          date: "2026-06-29",
+          locked: true,
+          lockReason: "private_message",
+        },
+        {
+          content: "",
+          isFromAI: true,
+          date: "2026-06-29",
+          locked: true,
+          lockReason: "voice_message",
+        },
+        {
+          content: "",
+          isFromAI: true,
+          date: "2026-06-29",
+          locked: true,
+          lockReason: "daily_limit",
+        },
+        {
+          content: "user text",
+          isFromAI: false,
+          date: "2026-06-29",
+          locked: true,
+          lockReason: "private_message",
+        },
+      ]),
+    ).toBe(2);
+  });
+});