refactor(chat): split screen orchestration

src/app/chat/__tests__/chat-area.helpers.test.ts

@@ -0,0 +1,45 @@
+import { describe, expect, it } from "vitest";
+
+import type { UiMessage } from "@/data/dto/chat";
+
+import {
+  buildChatRenderItems,
+  createChatMessageKeyResolver,
+} from "../components/chat-area";
+
+describe("chat area render items", () => {
+  it("keeps local message keys stable when history is prepended", () => {
+    const localMessage: UiMessage = {
+      content: "optimistic message",
+      isFromAI: false,
+      date: "2026-07-08",
+    };
+    const historyMessage: UiMessage = {
+      id: "history-msg-1",
+      content: "history message",
+      isFromAI: true,
+      date: "2026-07-07",
+    };
+    const getMessageKey = createChatMessageKeyResolver();
+
+    const firstItems = buildChatRenderItems([localMessage], getMessageKey);
+    const secondItems = buildChatRenderItems(
+      [historyMessage, localMessage],
+      getMessageKey,
+    );
+
+    expect(findMessageKey(firstItems, localMessage)).toBe("local-msg-1");
+    expect(findMessageKey(secondItems, localMessage)).toBe("local-msg-1");
+    expect(findMessageKey(secondItems, historyMessage)).toBe(
+      "msg-history-msg-1",
+    );
+  });
+});
+
+function findMessageKey(
+  items: ReturnType<typeof buildChatRenderItems>,
+  message: UiMessage,
+): string | undefined {
+  return items.find((item) => item.type === "msg" && item.message === message)
+    ?.key;
+}

src/app/chat/__tests__/chat-screen.helpers.test.ts

@@ -1,6 +1,9 @@
 import { describe, expect, it } from "vitest";
 
-import { getInsufficientCreditsMessageLimitView } from "../chat-screen.helpers";
+import {
+  getInsufficientCreditsMessageLimitView,
+  shouldShowMessageLimitBanner,
+} from "../chat-screen.helpers";
 
 describe("getInsufficientCreditsMessageLimitView", () => {
   it("asks guests to log in for more free chats", () => {
@@ -33,3 +36,32 @@ describe("getInsufficientCreditsMessageLimitView", () => {
     },
   );
 });
+
+describe("shouldShowMessageLimitBanner", () => {
+  it("shows only for visible insufficient credit prompts", () => {
+    expect(
+      shouldShowMessageLimitBanner({
+        upgradePromptVisible: true,
+        upgradeReason: "insufficient_credits",
+      }),
+    ).toBe(true);
+  });
+
+  it("hides when the prompt is not visible", () => {
+    expect(
+      shouldShowMessageLimitBanner({
+        upgradePromptVisible: false,
+        upgradeReason: "insufficient_credits",
+      }),
+    ).toBe(false);
+  });
+
+  it("hides when there is no upgrade reason", () => {
+    expect(
+      shouldShowMessageLimitBanner({
+        upgradePromptVisible: true,
+        upgradeReason: null,
+      }),
+    ).toBe(false);
+  });
+});

src/app/chat/__tests__/use-chat-guest-login.test.ts

@@ -0,0 +1,60 @@
+import { describe, expect, it } from "vitest";
+
+import { shouldSubmitGuestLogin } from "../hooks/use-chat-guest-login";
+
+describe("shouldSubmitGuestLogin", () => {
+  it("submits once after auth initialization reaches notLoggedIn", () => {
+    expect(
+      shouldSubmitGuestLogin({
+        alreadyRequested: false,
+        hasInitialized: true,
+        isLoading: false,
+        loginStatus: "notLoggedIn",
+      }),
+    ).toBe(true);
+  });
+
+  it("waits until auth initialization has completed", () => {
+    expect(
+      shouldSubmitGuestLogin({
+        alreadyRequested: false,
+        hasInitialized: false,
+        isLoading: false,
+        loginStatus: "notLoggedIn",
+      }),
+    ).toBe(false);
+  });
+
+  it("does not submit while auth is already loading", () => {
+    expect(
+      shouldSubmitGuestLogin({
+        alreadyRequested: false,
+        hasInitialized: true,
+        isLoading: true,
+        loginStatus: "notLoggedIn",
+      }),
+    ).toBe(false);
+  });
+
+  it("does not submit again for the same notLoggedIn window", () => {
+    expect(
+      shouldSubmitGuestLogin({
+        alreadyRequested: true,
+        hasInitialized: true,
+        isLoading: false,
+        loginStatus: "notLoggedIn",
+      }),
+    ).toBe(false);
+  });
+
+  it("does not submit when the user already has a login status", () => {
+    expect(
+      shouldSubmitGuestLogin({
+        alreadyRequested: false,
+        hasInitialized: true,
+        isLoading: false,
+        loginStatus: "guest",
+      }),
+    ).toBe(false);
+  });
+});

src/app/chat/chat-screen.helpers.ts

@@ -1,6 +1,7 @@
 "use client";
 
 import type { LoginStatus } from "@/data/dto/auth";
+import type { ChatUpgradeReason } from "@/stores/chat/chat-state";
 import { AppEnvUtil, BrowserDetector } from "@/utils";
 
 export interface ExternalBrowserPromptState {
@@ -18,10 +19,22 @@ export interface InsufficientCreditsMessageLimitView {
   action: InsufficientCreditsAction;
 }
 
+export interface MessageLimitBannerState {
+  upgradePromptVisible: boolean;
+  upgradeReason: ChatUpgradeReason | null;
+}
+
 export function deriveIsGuest(loginStatus: LoginStatus): boolean {
   return loginStatus === "guest";
 }
 
+export function shouldShowMessageLimitBanner({
+  upgradePromptVisible,
+  upgradeReason,
+}: MessageLimitBannerState): boolean {
+  return upgradePromptVisible && upgradeReason === "insufficient_credits";
+}
+
 export function getInsufficientCreditsMessageLimitView(
   loginStatus: LoginStatus,
 ): InsufficientCreditsMessageLimitView {

src/app/chat/chat-screen.tsx

@@ -1,18 +1,10 @@
 "use client";
 
-import { useEffect, useRef, useState } from "react";
 import Image from "next/image";
 
 import { useAuthDispatch, useAuthState } from "@/stores/auth/auth-context";
-import { useChatDispatch, useChatState } from "@/stores/chat/chat-context";
-import { useUserState } from "@/stores/user/user-context";
+import { useChatState } from "@/stores/chat/chat-context";
 import { ROUTES } from "@/router/routes";
-import { useAppNavigator } from "@/router/use-app-navigator";
-import {
-  openChatInExternalBrowser,
-  recordExternalBrowserPromptShown,
-  resolveExternalBrowserPromptEligibility,
-} from "@/lib/chat/chat_external_browser";
 
 import { MobileShell } from "@/app/_components/core";
 
@@ -22,32 +14,26 @@ import {
   ChatHeader,
   ChatInputBar,
   ChatInsufficientCreditsBanner,
+  ChatUnlockDialogs,
   ExternalBrowserDialog,
   FirstRechargeOfferBanner,
-  HistoryUnlockDialog,
-  InsufficientCreditsDialog,
   PwaInstallOverlay,
 } from "./components";
 import {
   deriveIsGuest,
-  getInsufficientCreditsMessageLimitView,
-  getInsufficientCreditsSubscriptionType,
   isChatDevelopmentEnvironment,
-  shouldStartExternalBrowserPrompt,
 } from "./chat-screen.helpers";
 import { useFirstRechargeOfferBanner } from "./hooks/use-first-recharge-offer-banner";
 import { useChatUnlockNavigationFlow } from "./hooks/use-chat-unlock-navigation-flow";
+import { useChatGuestLogin } from "./hooks/use-chat-guest-login";
+import { useChatMessageLimitBanner } from "./hooks/use-chat-message-limit-banner";
+import { useExternalBrowserPrompt } from "./hooks/use-external-browser-prompt";
 import styles from "./components/chat-screen.module.css";
 
 export function ChatScreen() {
   const state = useChatState();
-  const chatDispatch = useChatDispatch();
   const authState = useAuthState();
   const authDispatch = useAuthDispatch();
-  const userState = useUserState();
-  const navigator = useAppNavigator();
-  const [showExternalBrowserDialog, setShowExternalBrowserDialog] =
-    useState(false);
   const {
     unlockPaywallRequest,
     requestMessageUnlock,
@@ -59,100 +45,33 @@ export function ChatScreen() {
   const isGuest = deriveIsGuest(authState.loginStatus);
 
   // 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 === "insufficient_credits";
-  const messageLimitView = getInsufficientCreditsMessageLimitView(
-    authState.loginStatus,
-  );
+  const messageLimitBanner = useChatMessageLimitBanner({
+    upgradePromptVisible: state.upgradePromptVisible,
+    upgradeReason: state.upgradeReason,
+    loginStatus: authState.loginStatus,
+  });
   const firstRechargeOfferBanner = useFirstRechargeOfferBanner({
     historyLoaded: state.historyLoaded,
     loginStatus: authState.loginStatus,
   });
   const shouldShowPwaInstall = state.historyLoaded && state.messages.length >= 10;
-
-  const externalBrowserPromptShownRef = useRef(false);
-  const guestLoginRequestedRef = useRef(false);
-
-  useEffect(() => {
-    if (!authState.hasInitialized || authState.isLoading) return;
-
-    if (authState.loginStatus !== "notLoggedIn") {
-      guestLoginRequestedRef.current = false;
-      return;
-    }
-
-    if (guestLoginRequestedRef.current) return;
-    guestLoginRequestedRef.current = true;
-    authDispatch({ type: "AuthGuestLoginSubmitted" });
-  }, [
-    authDispatch,
-    authState.hasInitialized,
-    authState.isLoading,
-    authState.loginStatus,
-  ]);
-
-  useEffect(() => {
-    if (
-      !shouldStartExternalBrowserPrompt({
+  const externalBrowserPrompt = useExternalBrowserPrompt({
     hasInitialized: authState.hasInitialized,
     isLoading: authState.isLoading,
     loginStatus: authState.loginStatus,
-      })
-    ) {
-      return;
-    }
+  });
 
-    let mounted = true;
-    let timer: number | undefined;
-
-    const init = async () => {
-      if (externalBrowserPromptShownRef.current) return;
-
-      const eligibility = await resolveExternalBrowserPromptEligibility();
-      if (!mounted || !eligibility.canShow) return;
-
-      externalBrowserPromptShownRef.current = true;
-      timer = window.setTimeout(() => {
-        if (!mounted) return;
-        setShowExternalBrowserDialog(true);
-        void recordExternalBrowserPromptShown(eligibility.today);
-      }, 3000);
-    };
-
-    void init();
-
-    return () => {
-      mounted = false;
-      if (timer !== undefined) window.clearTimeout(timer);
-    };
-  }, [
-    authState.hasInitialized,
-    authState.isLoading,
-    authState.loginStatus,
-  ]);
-
-  async function handleOpenExternalBrowser(): Promise<void> {
-    setShowExternalBrowserDialog(false);
-    await openChatInExternalBrowser();
-  }
+  useChatGuestLogin({
+    dispatch: authDispatch,
+    hasInitialized: authState.hasInitialized,
+    isLoading: authState.isLoading,
+    loginStatus: authState.loginStatus,
+  });
 
   function handleUnlockPrivateMessage(messageId: string): void {
     requestMessageUnlock(messageId, "private");
   }
 
-  function handleMessageLimitUnlock(): void {
-    if (messageLimitView.action === "auth") {
-      navigator.openAuth(ROUTES.chat);
-      return;
-    }
-
-    navigator.openSubscription({
-      type: getInsufficientCreditsSubscriptionType(userState.isVip),
-      returnTo: "chat",
-    });
-  }
-
   function handleUnlockVoiceMessage(messageId: string): void {
     requestMessageUnlock(messageId, "voice");
   }
@@ -187,19 +106,18 @@ export function ChatScreen() {
           <ChatArea
             messages={state.messages}
             isReplyingAI={state.isReplyingAI}
-            isGuest={isGuest}
             isUnlockingMessage={state.isUnlockingMessage}
             unlockingMessageId={state.unlockingMessageId}
             onUnlockPrivateMessage={handleUnlockPrivateMessage}
             onUnlockVoiceMessage={handleUnlockVoiceMessage}
           />
 
-          {showMessageLimitBanner ? (
+          {messageLimitBanner.visible ? (
             <ChatInsufficientCreditsBanner
-              title={messageLimitView.title}
-              description={messageLimitView.description}
-              ctaLabel={messageLimitView.ctaLabel}
-              onUnlock={handleMessageLimitUnlock}
+              title={messageLimitBanner.title}
+              description={messageLimitBanner.description}
+              ctaLabel={messageLimitBanner.ctaLabel}
+              onUnlock={messageLimitBanner.unlock}
             />
           ) : (
             <ChatInputBar disabled={!state.historyLoaded} />
@@ -213,27 +131,15 @@ export function ChatScreen() {
         <PwaInstallOverlay enabled={shouldShowPwaInstall} />
 
         <ExternalBrowserDialog
-          open={showExternalBrowserDialog}
-          onClose={() => setShowExternalBrowserDialog(false)}
-          onConfirm={() => void handleOpenExternalBrowser()}
+          open={externalBrowserPrompt.open}
+          onClose={externalBrowserPrompt.close}
+          onConfirm={() => void externalBrowserPrompt.confirm()}
         />
 
-        <HistoryUnlockDialog
-          open={state.unlockHistoryPromptVisible}
-          lockedCount={state.lockedHistoryCount}
-          isLoading={state.isUnlockingHistory}
-          errorMessage={state.unlockHistoryError}
-          onClose={() => chatDispatch({ type: "ChatUnlockHistoryDismissed" })}
-          onConfirm={() => chatDispatch({ type: "ChatUnlockHistoryConfirmed" })}
-        />
-
-        <InsufficientCreditsDialog
-          open={unlockPaywallRequest !== null}
-          creditBalance={unlockPaywallRequest?.creditBalance ?? 0}
-          requiredCredits={unlockPaywallRequest?.requiredCredits ?? 0}
-          shortfallCredits={unlockPaywallRequest?.shortfallCredits ?? 0}
-          onClose={closeInsufficientCreditsDialog}
-          onConfirm={confirmInsufficientCreditsDialog}
+        <ChatUnlockDialogs
+          unlockPaywallRequest={unlockPaywallRequest}
+          onCloseInsufficientCreditsDialog={closeInsufficientCreditsDialog}
+          onConfirmInsufficientCreditsDialog={confirmInsufficientCreditsDialog}
         />
       </div>
     </MobileShell>

src/app/chat/components/chat-area.module.css

@@ -59,6 +59,32 @@
   gap: var(--spacing-1, 4px);
 }
 
+.bubbleInlineSpacer {
+  flex: 0 0 var(--spacing-sm, 8px);
+  width: var(--spacing-sm, 8px);
+}
+
+.bubbleAvatarSpacer {
+  flex: 0 0 var(--chat-avatar-size, 43px);
+  width: var(--chat-avatar-size, 43px);
+}
+
+.messageContent {
+  display: flex;
+  flex: 1 1 0;
+  min-width: 0;
+  flex-direction: column;
+  gap: var(--spacing-sm, 8px);
+}
+
+.messageContentAi {
+  align-items: flex-start;
+}
+
+.messageContentUser {
+  align-items: flex-end;
+}
+
 .bubbleAi {
   max-width: var(--chat-bubble-max-width, 75%);
   background: var(--color-bubble-ai, rgba(255, 255, 255, 0.08));

src/app/chat/components/chat-area.tsx

@@ -12,7 +12,7 @@
  *   - 新消息到达时自动滚到底部
  *   - 用户向上滚动时不强制拉回（保持阅读上下文）
  */
-import { useEffect, useLayoutEffect, useRef } from "react";
+import { useEffect, useLayoutEffect, useMemo, useRef } from "react";
 
 import type { UiMessage } from "@/data/dto/chat";
 
@@ -31,11 +31,14 @@ import styles from "./chat-area.module.css";
 const CHAT_AUTO_SCROLL_BOTTOM_THRESHOLD = 96;
 
 type RestoreState = "idle" | "checking" | "restoring" | "settlingBottom" | "done";
+type ChatMessageKeyResolver = (message: UiMessage) => string;
+type ChatRenderItem =
+  | { type: "date"; date: string; key: string }
+  | { type: "msg"; message: UiMessage; key: string };
 
 export interface ChatAreaProps {
   messages: readonly UiMessage[];
   isReplyingAI: boolean;
-  isGuest: boolean;
   isUnlockingMessage?: boolean;
   unlockingMessageId?: string | null;
   onUnlockPrivateMessage?: (messageId: string) => void;
@@ -55,6 +58,7 @@ export function ChatArea({
   const restoredScrollRef = useRef(false);
   const restoreStateRef = useRef<RestoreState>("idle");
   const wasNearBottomRef = useRef(true);
+  const getMessageKey = useMemo(() => createChatMessageKeyResolver(), []);
 
   const saveCurrentScrollSnapshotNow = (anchorMessageId: string) => {
     const scrollNode = scrollRef.current;
@@ -160,6 +164,7 @@ export function ChatArea({
 
       {renderMessagesWithDateHeaders(
         messages,
+        getMessageKey,
         isUnlockingMessage,
         unlockingMessageId,
         onUnlockPrivateMessage,
@@ -221,21 +226,13 @@ function startStableScrollTask({
 /** 渲染消息列表（按日期分组插入分隔条） */
 function renderMessagesWithDateHeaders(
   messages: readonly UiMessage[],
+  getMessageKey: (message: UiMessage) => string,
   isUnlockingMessage?: boolean,
   unlockingMessageId?: string | null,
   onUnlockPrivateMessage?: (messageId: string) => void,
   onUnlockVoiceMessage?: (messageId: string) => void,
 ) {
-  const items: Array<{ type: "date"; date: string; key: string } | { type: "msg"; message: UiMessage; key: string }> = [];
-
-  messages.forEach((m, i) => {
-    if (i === 0 || m.date !== messages[i - 1].date) {
-      items.push({ type: "date", date: m.date, key: `d-${i}-${m.date}` });
-    }
-    items.push({ type: "msg", message: m, key: `m-${i}` });
-  });
-
-  return items.map((item) =>
+  return buildChatRenderItems(messages, getMessageKey).map((item) =>
     item.type === "date" ? (
       <DateHeader key={item.key} date={item.date} />
     ) : (
@@ -261,3 +258,41 @@ function renderMessagesWithDateHeaders(
     ),
   );
 }
+
+export function createChatMessageKeyResolver(): ChatMessageKeyResolver {
+  const localMessageKeys = new WeakMap<UiMessage, string>();
+  let nextLocalMessageKey = 0;
+
+  return (message) => {
+    if (message.id && message.id.length > 0) return `msg-${message.id}`;
+
+    const existing = localMessageKeys.get(message);
+    if (existing) return existing;
+
+    nextLocalMessageKey += 1;
+    const next = `local-msg-${nextLocalMessageKey}`;
+    localMessageKeys.set(message, next);
+    return next;
+  };
+}
+
+export function buildChatRenderItems(
+  messages: readonly UiMessage[],
+  getMessageKey: ChatMessageKeyResolver,
+): ChatRenderItem[] {
+  const items: ChatRenderItem[] = [];
+
+  messages.forEach((message, index) => {
+    const messageKey = getMessageKey(message);
+    if (index === 0 || message.date !== messages[index - 1].date) {
+      items.push({
+        type: "date",
+        date: message.date,
+        key: `date-${message.date}-${messageKey}`,
+      });
+    }
+    items.push({ type: "msg", message, key: messageKey });
+  });
+
+  return items;
+}

src/app/chat/components/chat-unlock-dialogs.tsx

@@ -0,0 +1,43 @@
+"use client";
+
+import { useChatDispatch, useChatState } from "@/stores/chat/chat-context";
+import type { ChatUnlockPaywallRequest } from "@/stores/chat/chat-state";
+
+import { HistoryUnlockDialog } from "./history-unlock-dialog";
+import { InsufficientCreditsDialog } from "./insufficient-credits-dialog";
+
+export interface ChatUnlockDialogsProps {
+  unlockPaywallRequest: ChatUnlockPaywallRequest | null;
+  onCloseInsufficientCreditsDialog: () => void;
+  onConfirmInsufficientCreditsDialog: () => void;
+}
+
+export function ChatUnlockDialogs({
+  unlockPaywallRequest,
+  onCloseInsufficientCreditsDialog,
+  onConfirmInsufficientCreditsDialog,
+}: ChatUnlockDialogsProps) {
+  const chatState = useChatState();
+  const chatDispatch = useChatDispatch();
+
+  return (
+    <>
+      <HistoryUnlockDialog
+        open={chatState.unlockHistoryPromptVisible}
+        lockedCount={chatState.lockedHistoryCount}
+        isLoading={chatState.isUnlockingHistory}
+        errorMessage={chatState.unlockHistoryError}
+        onClose={() => chatDispatch({ type: "ChatUnlockHistoryDismissed" })}
+        onConfirm={() => chatDispatch({ type: "ChatUnlockHistoryConfirmed" })}
+      />
+      <InsufficientCreditsDialog
+        open={unlockPaywallRequest !== null}
+        creditBalance={unlockPaywallRequest?.creditBalance ?? 0}
+        requiredCredits={unlockPaywallRequest?.requiredCredits ?? 0}
+        shortfallCredits={unlockPaywallRequest?.shortfallCredits ?? 0}
+        onClose={onCloseInsufficientCreditsDialog}
+        onConfirm={onConfirmInsufficientCreditsDialog}
+      />
+    </>
+  );
+}

src/app/chat/components/index.ts

@@ -10,6 +10,7 @@ export * from "./chat-insufficient-credits-banner";
 export * from "./chat-input-bar";
 export * from "./chat-input-text-field";
 export * from "./chat-send-button";
+export * from "./chat-unlock-dialogs";
 export * from "./date-header";
 export * from "./external-browser-dialog";
 export * from "./first-recharge-offer-banner";

src/app/chat/components/message-bubble.tsx

@@ -55,7 +55,7 @@ export function MessageBubble({
         aria-label="AI message"
       >
         <MessageAvatar isFromAI={true} />
-        <div style={{ width: 8 }} />
+        <div className={styles.bubbleInlineSpacer} aria-hidden="true" />
         <MessageContent
           content={content}
           imageUrl={imageUrl}
@@ -71,7 +71,7 @@ export function MessageBubble({
           onUnlockPrivateMessage={onUnlockPrivateMessage}
           onUnlockVoiceMessage={onUnlockVoiceMessage}
         />
-        <div style={{ width: 43 }} /> {/* 占位：保持与头像宽度一致 */}
+        <div className={styles.bubbleAvatarSpacer} aria-hidden="true" />
       </div>
     );
   }
@@ -82,7 +82,7 @@ export function MessageBubble({
       data-chat-message-id={messageId}
       aria-label="User message"
     >
-      <div style={{ width: 43 }} /> {/* 占位 */}
+      <div className={styles.bubbleAvatarSpacer} aria-hidden="true" />
       <MessageContent
         content={content}
         imageUrl={imageUrl}
@@ -98,7 +98,7 @@ export function MessageBubble({
         onUnlockPrivateMessage={onUnlockPrivateMessage}
         onUnlockVoiceMessage={onUnlockVoiceMessage}
       />
-      <div style={{ width: 8 }} />
+      <div className={styles.bubbleInlineSpacer} aria-hidden="true" />
       <MessageAvatar isFromAI={false} userAvatarUrl={avatarUrl} />
     </div>
   );

src/app/chat/components/message-content.tsx

@@ -3,6 +3,7 @@ import { ImageBubble } from "./image-bubble";
 import { PrivateMessageCard } from "./private-message-card";
 import { TextBubble } from "./text-bubble";
 import { VoiceBubble } from "./voice-bubble";
+import styles from "./chat-area.module.css";
 
 export interface MessageContentProps {
   content: string;
@@ -55,16 +56,10 @@ export function MessageContent({
 
   return (
     <div
-      style={{
-        display: "flex",
-        flexDirection: "column",
-        // 关键：在 row flex 父中撑开（不依赖 content 循环）—— 让 TextBubble 能拿到真实宽度
-        flex: "1 1 0",
-        // 防超长 content（图片 / 超长 url）撑爆父
-        minWidth: 0,
-        alignItems: isFromAI ? "flex-start" : "flex-end",
-        gap: 8,
-      }}
+      className={[
+        styles.messageContent,
+        isFromAI ? styles.messageContentAi : styles.messageContentUser,
+      ].join(" ")}
     >
       {isLockedPrivateMessage ? (
         <PrivateMessageCard

src/app/chat/hooks/use-chat-guest-login.ts

@@ -0,0 +1,63 @@
+"use client";
+
+import { type Dispatch, useEffect, useRef } from "react";
+
+import type { LoginStatus } from "@/data/dto/auth";
+import type { AuthEvent } from "@/stores/auth/auth-events";
+
+export interface GuestLoginState {
+  hasInitialized: boolean;
+  isLoading: boolean;
+  loginStatus: LoginStatus;
+}
+
+export interface ShouldSubmitGuestLoginInput extends GuestLoginState {
+  alreadyRequested: boolean;
+}
+
+export interface UseChatGuestLoginInput extends GuestLoginState {
+  dispatch: Dispatch<AuthEvent>;
+}
+
+export function shouldSubmitGuestLogin({
+  alreadyRequested,
+  hasInitialized,
+  isLoading,
+  loginStatus,
+}: ShouldSubmitGuestLoginInput): boolean {
+  if (!hasInitialized || isLoading) return false;
+  if (loginStatus !== "notLoggedIn") return false;
+  return !alreadyRequested;
+}
+
+export function useChatGuestLogin({
+  dispatch,
+  hasInitialized,
+  isLoading,
+  loginStatus,
+}: UseChatGuestLoginInput): void {
+  const guestLoginRequestedRef = useRef(false);
+
+  useEffect(() => {
+    if (!hasInitialized || isLoading) return;
+
+    if (loginStatus !== "notLoggedIn") {
+      guestLoginRequestedRef.current = false;
+      return;
+    }
+
+    if (
+      !shouldSubmitGuestLogin({
+        alreadyRequested: guestLoginRequestedRef.current,
+        hasInitialized,
+        isLoading,
+        loginStatus,
+      })
+    ) {
+      return;
+    }
+
+    guestLoginRequestedRef.current = true;
+    dispatch({ type: "AuthGuestLoginSubmitted" });
+  }, [dispatch, hasInitialized, isLoading, loginStatus]);
+}

src/app/chat/hooks/use-chat-message-limit-banner.ts

@@ -0,0 +1,57 @@
+"use client";
+
+import type { LoginStatus } from "@/data/dto/auth";
+import { ROUTES } from "@/router/routes";
+import { useAppNavigator } from "@/router/use-app-navigator";
+import type { ChatUpgradeReason } from "@/stores/chat/chat-state";
+import { useUserState } from "@/stores/user/user-context";
+
+import {
+  getInsufficientCreditsMessageLimitView,
+  getInsufficientCreditsSubscriptionType,
+  shouldShowMessageLimitBanner,
+  type InsufficientCreditsMessageLimitView,
+} from "../chat-screen.helpers";
+
+export interface UseChatMessageLimitBannerInput {
+  upgradePromptVisible: boolean;
+  upgradeReason: ChatUpgradeReason | null;
+  loginStatus: LoginStatus;
+}
+
+export interface ChatMessageLimitBannerView
+  extends InsufficientCreditsMessageLimitView {
+  visible: boolean;
+  unlock: () => void;
+}
+
+export function useChatMessageLimitBanner({
+  upgradePromptVisible,
+  upgradeReason,
+  loginStatus,
+}: UseChatMessageLimitBannerInput): ChatMessageLimitBannerView {
+  const navigator = useAppNavigator();
+  const userState = useUserState();
+  const view = getInsufficientCreditsMessageLimitView(loginStatus);
+
+  function unlock(): void {
+    if (view.action === "auth") {
+      navigator.openAuth(ROUTES.chat);
+      return;
+    }
+
+    navigator.openSubscription({
+      type: getInsufficientCreditsSubscriptionType(userState.isVip),
+      returnTo: "chat",
+    });
+  }
+
+  return {
+    ...view,
+    visible: shouldShowMessageLimitBanner({
+      upgradePromptVisible,
+      upgradeReason,
+    }),
+    unlock,
+  };
+}

src/app/chat/hooks/use-external-browser-prompt.ts

@@ -0,0 +1,82 @@
+"use client";
+
+import { useCallback, useEffect, useRef, useState } from "react";
+
+import {
+  openChatInExternalBrowser,
+  recordExternalBrowserPromptShown,
+  resolveExternalBrowserPromptEligibility,
+} from "@/lib/chat/chat_external_browser";
+
+import {
+  type ExternalBrowserPromptState,
+  shouldStartExternalBrowserPrompt,
+} from "../chat-screen.helpers";
+
+const EXTERNAL_BROWSER_PROMPT_DELAY_MS = 3000;
+
+export interface ExternalBrowserPromptController {
+  open: boolean;
+  close: () => void;
+  confirm: () => Promise<void>;
+}
+
+export function useExternalBrowserPrompt({
+  hasInitialized,
+  isLoading,
+  loginStatus,
+}: ExternalBrowserPromptState): ExternalBrowserPromptController {
+  const [open, setOpen] = useState(false);
+  const promptShownRef = useRef(false);
+
+  useEffect(() => {
+    if (
+      !shouldStartExternalBrowserPrompt({
+        hasInitialized,
+        isLoading,
+        loginStatus,
+      })
+    ) {
+      return;
+    }
+
+    let mounted = true;
+    let timer: number | undefined;
+
+    const init = async () => {
+      if (promptShownRef.current) return;
+
+      const eligibility = await resolveExternalBrowserPromptEligibility();
+      if (!mounted || !eligibility.canShow) return;
+
+      promptShownRef.current = true;
+      timer = window.setTimeout(() => {
+        if (!mounted) return;
+        setOpen(true);
+        void recordExternalBrowserPromptShown(eligibility.today);
+      }, EXTERNAL_BROWSER_PROMPT_DELAY_MS);
+    };
+
+    void init();
+
+    return () => {
+      mounted = false;
+      if (timer !== undefined) window.clearTimeout(timer);
+    };
+  }, [hasInitialized, isLoading, loginStatus]);
+
+  const close = useCallback(() => {
+    setOpen(false);
+  }, []);
+
+  const confirm = useCallback(async () => {
+    setOpen(false);
+    await openChatInExternalBrowser();
+  }, []);
+
+  return {
+    open,
+    close,
+    confirm,
+  };
+}

src/app/chat/image/[messageId]/chat-image-viewer-screen.tsx

@@ -3,12 +3,11 @@
 import { MobileShell } from "@/app/_components/core";
 import { ROUTE_BUILDERS } from "@/router/routes";
 import { useAppNavigator } from "@/router/use-app-navigator";
-import { useChatDispatch, useChatState } from "@/stores/chat/chat-context";
+import { useChatState } from "@/stores/chat/chat-context";
 
 import {
+  ChatUnlockDialogs,
   FullscreenImageViewer,
-  HistoryUnlockDialog,
-  InsufficientCreditsDialog,
 } from "../../components";
 import { useChatUnlockNavigationFlow } from "../../hooks/use-chat-unlock-navigation-flow";
 import styles from "./chat-image-viewer-screen.module.css";
@@ -22,7 +21,6 @@ export function ChatImageViewerScreen({
 }: ChatImageViewerScreenProps) {
   const navigator = useAppNavigator();
   const chatState = useChatState();
-  const chatDispatch = useChatDispatch();
   const returnUrl = ROUTE_BUILDERS.chatImage(messageId);
   const {
     unlockPaywallRequest,
@@ -46,25 +44,12 @@ export function ChatImageViewerScreen({
     requestMessageUnlock(messageId, "image");
   };
 
-  const historyUnlockDialog = (
-    <>
-      <HistoryUnlockDialog
-        open={chatState.unlockHistoryPromptVisible}
-        lockedCount={chatState.lockedHistoryCount}
-        isLoading={chatState.isUnlockingHistory}
-        errorMessage={chatState.unlockHistoryError}
-        onClose={() => chatDispatch({ type: "ChatUnlockHistoryDismissed" })}
-        onConfirm={() => chatDispatch({ type: "ChatUnlockHistoryConfirmed" })}
+  const unlockDialogs = (
+    <ChatUnlockDialogs
+      unlockPaywallRequest={unlockPaywallRequest}
+      onCloseInsufficientCreditsDialog={closeInsufficientCreditsDialog}
+      onConfirmInsufficientCreditsDialog={confirmInsufficientCreditsDialog}
     />
-      <InsufficientCreditsDialog
-        open={unlockPaywallRequest !== null}
-        creditBalance={unlockPaywallRequest?.creditBalance ?? 0}
-        requiredCredits={unlockPaywallRequest?.requiredCredits ?? 0}
-        shortfallCredits={unlockPaywallRequest?.shortfallCredits ?? 0}
-        onClose={closeInsufficientCreditsDialog}
-        onConfirm={confirmInsufficientCreditsDialog}
-      />
-    </>
   );
 
   if (!message) {
@@ -84,7 +69,7 @@ export function ChatImageViewerScreen({
             </p>
           </main>
         </MobileShell>
-        {historyUnlockDialog}
+        {unlockDialogs}
       </>
     );
   }
@@ -104,7 +89,7 @@ export function ChatImageViewerScreen({
           onClose={handleClose}
         />
       </MobileShell>
-      {historyUnlockDialog}
+      {unlockDialogs}
     </>
   );
 }