refactor(chat): remove weekly limit flow

src/app/chat/chat-screen.tsx

@@ -58,19 +58,13 @@ export function ChatScreen() {
     authState.loginStatus !== "notLoggedIn" &&
     authState.loginStatus !== "guest";
 
-  // 消息数量限制由后端统一返回 lockDetail，前端不再处理本地额度。
+  // 发送能力由后端统一返回，当前只处理积分不足引导。
   const showMessageLimitBanner =
     state.upgradePromptVisible &&
-    (state.upgradeReason === "weekly_limit" ||
+    state.upgradeReason === "insufficient_credits";
-      state.upgradeReason === "insufficient_credits");
   const messageLimitTitle =
-    state.upgradeReason === "insufficient_credits"
+    "Insufficient credits\nTop up to continue chatting";
-      ? "Insufficient credits\nTop up to continue chatting"
+  const messageLimitCtaLabel = "Top up credits to continue";
-      : "The limit for free chat times\nhas been reached";
-  const messageLimitCtaLabel =
-    state.upgradeReason === "insufficient_credits"
-      ? "Top up credits to continue"
-      : "Unlock your membership to continue";
 
   const externalBrowserPromptShownRef = useRef(false);
 
@@ -188,15 +182,10 @@ export function ChatScreen() {
   }
 
   function handleMessageLimitUnlock(): void {
-    const subscriptionType =
-      state.upgradeReason === "insufficient_credits"
-        ? getInsufficientCreditsSubscriptionType(userState.isVip)
-        : "vip";
-
     router.push(
       getChatPaywallNavigationUrl(
         authState.loginStatus,
-        subscriptionType,
+        getInsufficientCreditsSubscriptionType(userState.isVip),
       ),
     );
   }

src/app/chat/components/chat-quota-exhausted-banner.tsx

@@ -1,14 +1,14 @@
 "use client";
 /**
- * ChatQuotaExhaustedBanner 游客配额耗尽横幅
+ * ChatQuotaExhaustedBanner 发送受限横幅
  *
  * 何时显示：
- *   - 后端返回 lockDetail.reason="weekly_limit" 且 showUpgrade=true
+ *   - 后端返回 cannotSendReason="insufficient_credits"
  *
  * 视觉规格（与设计稿对齐）：
  *   - 粉→品红渐变背景（与 splash 渐变一致）
- *   - 大字号粉色/白色提示文案（"The limit for free chat times has been reached today"）
+ *   - 大字号粉色/白色提示文案
- *   - 粉→品红渐变 pill 按钮"Unlock your membership to continue" → 跳 /subscription
+ *   - 粉→品红渐变 pill 按钮 → 跳 /subscription
  *
  * 业务关系：
  *   - 与 `src/app/sidebar/components/vip-benefits-card.tsx` 的 "Activate VIP Membership" 行为一致
@@ -36,8 +36,8 @@ export interface ChatQuotaExhaustedBannerProps {
 }
 
 export function ChatQuotaExhaustedBanner({
-  title = "The limit for free chat times\nhas been reached today",
+  title = "Insufficient credits\nTop up to continue chatting",
-  ctaLabel = "Unlock your membership to continue",
+  ctaLabel = "Top up credits to continue",
   onUnlock,
 }: ChatQuotaExhaustedBannerProps) {
   const router = useRouter();

src/data/storage/chat/chat_storage.ts

@@ -14,5 +14,5 @@ export class ChatStorage {
   }
 
   // 本地游客消息数量额度逻辑已停用：
-  // 游客 / 非游客的消息数量限制统一由后端接口返回 lockDetail/daily_limit。
+  // 游客 / 非游客的发送能力统一以后端返回的积分状态为准。
 }

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

@@ -143,43 +143,6 @@ describe("sendResponseToUiMessage", () => {
 });
 
 describe("applyHttpSendOutput", () => {
-  it("removes the optimistic user message when the weekly limit is reached", () => {
-    const context = makeChatState({
-      messages: [
-        {
-          content: "hello",
-          isFromAI: false,
-          date: "2026-06-25",
-        },
-      ],
-    });
-
-    const nextState = applyHttpSendOutput(context, {
-      response: makeResponse({
-        reply: "",
-        messageId: "",
-        lockDetail: {
-          locked: true,
-          showContent: false,
-          showUpgrade: true,
-          reason: "weekly_limit",
-          hint: "Free message limit reached.",
-          detail: {
-            type: "weekly_msg_limit",
-            usedThisWeek: 3,
-            limit: 3,
-          },
-        },
-      }),
-      reply: null,
-    });
-
-    expect(nextState.messages).toEqual([]);
-    expect(nextState.isReplyingAI).toBe(false);
-    expect(nextState.upgradePromptVisible).toBe(true);
-    expect(nextState.upgradeReason).toBe("weekly_limit");
-  });
-
   it("stores insufficient credit state and removes failed optimistic messages", () => {
     const context = makeChatState({
       messages: [
@@ -363,7 +326,7 @@ describe("countLockedHistoryMessages", () => {
           isFromAI: true,
           date: "2026-06-29",
           locked: true,
-          lockReason: "weekly_limit",
+          lockReason: "insufficient_credits",
         },
         {
           content: "user text",

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

@@ -767,7 +767,7 @@ describe("chatMachine transitions", () => {
     actor.stop();
   });
 
-  it("clears the weekly limit prompt after payment succeeds", async () => {
+  it("clears the insufficient credits prompt after payment succeeds", async () => {
     const actor = createActor(createTestChatMachine()).start();
 
     actor.send({ type: "ChatUserLogin", token: "token" });
@@ -789,12 +789,12 @@ describe("chatMachine transitions", () => {
             locked: true,
             showContent: false,
             showUpgrade: true,
-            reason: "weekly_limit",
+            reason: "insufficient_credits",
-            hint: "Free message limit reached.",
+            hint: "Insufficient credits.",
             detail: {
-              type: "weekly_msg_limit",
+              requiredCredits: 2,
-              usedThisWeek: 3,
+              currentCredits: 0,
-              limit: 3,
+              shortfallCredits: 2,
             },
           },
           canSendMessage: false,
@@ -808,7 +808,9 @@ describe("chatMachine transitions", () => {
     });
 
     expect(actor.getSnapshot().context.upgradePromptVisible).toBe(true);
-    expect(actor.getSnapshot().context.upgradeReason).toBe("weekly_limit");
+    expect(actor.getSnapshot().context.upgradeReason).toBe(
+      "insufficient_credits",
+    );
     expect(actor.getSnapshot().context.canSendMessage).toBe(false);
 
     actor.send({ type: "ChatPaymentSucceeded" });

src/stores/chat/chat-machine.ts

@@ -21,9 +21,9 @@
  *   - guestSession / userSession：队列串行走 HTTP，限制以后端 `lockDetail` 为准
  *   - `pendingReplyCount` 跟踪待回复数量，`isReplyingAI` 由计数派生
  *
- * 配额：
+ * 发送能力：
  *   - 前端不再处理本地消息额度；游客 / 注册用户均以后端响应为准。
- *   - 后端返回 `lockDetail.reason="weekly_limit"` 且需要升级时展示会员引导。
+ *   - 后端返回 `cannotSendReason="insufficient_credits"` 时展示充值引导。
  *
  */
 

src/stores/chat/chat-send-flow.ts

@@ -167,10 +167,6 @@ async function sendMessageViaHttp(content: string): Promise<{
     throw result.error;
   }
   void chatRepo.prefetchMediaForSendResponse(result.data);
-  const isMessageLimit =
-    result.data.lockDetail.locked &&
-    result.data.lockDetail.showUpgrade &&
-    result.data.lockDetail.reason === "weekly_limit";
   const isInsufficientCredits =
     result.data.canSendMessage === false &&
     result.data.cannotSendReason === "insufficient_credits" &&
@@ -178,9 +174,7 @@ async function sendMessageViaHttp(content: string): Promise<{
   return {
     response: result.data,
     reply:
-      isMessageLimit || isInsufficientCredits
+      isInsufficientCredits ? null : sendResponseToUiMessage(result.data),
-        ? null
-        : sendResponseToUiMessage(result.data),
   };
 }
 

src/stores/chat/chat-send-state.ts

@@ -35,19 +35,12 @@ export function applyHttpSendOutput(
 ): Partial<ChatState> {
   const { response, reply } = output;
 
-  const lockDetail = response.lockDetail;
-  const isWeeklyLimitBlocked =
-    lockDetail.locked &&
-    lockDetail.showUpgrade &&
-    lockDetail.reason === "weekly_limit";
   const isInsufficientCredits =
     response.canSendMessage === false &&
     response.cannotSendReason === "insufficient_credits";
-  const upgradeReason: ChatUpgradeReason | null = isWeeklyLimitBlocked
+  const upgradeReason: ChatUpgradeReason | null = isInsufficientCredits
-    ? "weekly_limit"
+    ? "insufficient_credits"
-    : isInsufficientCredits
+    : null;
-      ? "insufficient_credits"
-      : null;
   const sendCapabilityState = getSendCapabilityState(response);
 
   if (upgradeReason) {
@@ -73,7 +66,10 @@ export function applyHttpSendOutput(
     };
   }
 
-  if (lockDetail.showUpgrade && lockDetail.reason === "private_message") {
+  if (
+    response.lockDetail.showUpgrade &&
+    response.lockDetail.reason === "private_message"
+  ) {
     return {
       messages: [...context.messages, reply],
       ...finishPendingReply(context),

src/stores/chat/chat-state.ts

@@ -1,7 +1,7 @@
 import type { UiMessage } from "@/data/dto/chat";
 import type { PendingChatUnlockKind } from "@/lib/navigation/chat_unlock_session";
 
-export type ChatUpgradeReason = "weekly_limit" | "insufficient_credits";
+export type ChatUpgradeReason = "insufficient_credits";
 
 export interface ChatUnlockPaywallRequest {
   messageId: string;