perf(bundle): replace broad storage and utils imports

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

@@ -2,7 +2,8 @@
 
 import type { LoginStatus } from "@/data/dto/auth";
 import type { ChatUpgradeReason } from "@/stores/chat/chat-state";
-import { AppEnvUtil, BrowserDetector } from "@/utils";
+import { AppEnvUtil } from "@/utils/app-env";
+import { BrowserDetector } from "@/utils/browser-detect";
 
 export interface ExternalBrowserPromptState {
   hasInitialized: boolean;

src/app/chat/components/chat-input-bar.tsx

@@ -3,7 +3,7 @@ import { useRef, useState } from "react";
 
 import { useChatDispatch } from "@/stores/chat/chat-context";
 import { useKeyboardHeight } from "@/hooks";
-import { Logger } from "@/utils";
+import { Logger } from "@/utils/logger";
 
 import { ChatInputTextField } from "./chat-input-text-field";
 import { ChatSendButton } from "./chat-send-button";

src/app/chat/components/pwa-install-overlay.tsx

@@ -19,7 +19,7 @@ import {
   canShowPwaInstallPromptOnce,
   recordPwaInstallPromptShown,
 } from "@/lib/chat/pwa_install_prompt";
-import { pwaUtil } from "@/utils";
+import { pwaUtil } from "@/utils/pwa";
 
 import { PwaInstallDialog } from "./pwa-install-dialog";
 

src/app/chat/hooks/use-chat-promotion-bootstrap.ts

@@ -7,7 +7,7 @@ import {
   peekPendingChatUnlock,
 } from "@/lib/navigation/chat_unlock_session";
 import { useChatDispatch } from "@/stores/chat/chat-context";
-import { Logger } from "@/utils";
+import { Logger } from "@/utils/logger";
 
 const log = new Logger("UseChatPromotionBootstrap");