refactor(router): centralize app route transitions

src/app/splash/splash-screen.tsx

@@ -1,12 +1,11 @@
 "use client";
 
 import { useEffect } from "react";
-import { useRouter } from "next/navigation";
 
 import { MobileShell } from "@/app/_components/core";
 import { hasBusinessLoginToken } from "@/lib/auth/auth_session";
+import { useAppNavigator } from "@/router/use-app-navigator";
 import { useAuthDispatch, useAuthState } from "@/stores/auth/auth-context";
-import { ROUTES } from "@/router/routes";
 import { pwaUtil, Logger } from "@/utils";
 
 import {
@@ -25,13 +24,13 @@ if (typeof window !== "undefined") {
 }
 
 export function SplashScreen() {
-  const router = useRouter();
+  const navigator = useAppNavigator();
   const state = useAuthState();
   const authDispatch = useAuthDispatch();
 
   const handleSkip = () => {
     authDispatch({ type: "AuthGuestLoginSubmitted" });
-    router.replace(ROUTES.chat);
+    navigator.openChat({ replace: true });
   };
 
   useEffect(() => {
@@ -49,13 +48,13 @@ export function SplashScreen() {
     let cancelled = false;
     void (async () => {
       if (!cancelled && (await hasBusinessLoginToken())) {
-        router.replace(ROUTES.chat);
+        navigator.openChat({ replace: true });
       }
     })();
     return () => {
       cancelled = true;
     };
-  }, [router]);
+  }, [navigator]);
 
   // ─────────────────────────────────────────────────────────────
   // useEffect ② 按钮刚派了事件（pendingRedirect=true） +
@@ -76,12 +75,12 @@ export function SplashScreen() {
 
     if (state.pendingRedirect && state.loginStatus !== "notLoggedIn") {
       log.debug(
-        "[splash] useEffect ② → router.replace(/chat) [via pendingRedirect flag]",
+        "[splash] useEffect ② → navigator.openChat [via pendingRedirect flag]",
       );
       authDispatch({ type: "AuthClearPendingRedirect" });
-      router.replace(ROUTES.chat);
+      navigator.openChat({ replace: true });
     }
-  }, [state.loginStatus, state.pendingRedirect, authDispatch, router]);
+  }, [state.loginStatus, state.pendingRedirect, authDispatch, navigator]);
 
   return (
     <MobileShell background="var(--color-sidebar-background)">