feat(assets): add initial fonts and image assets

src/app/splash/components/splash-screen.tsx

@@ -42,13 +42,19 @@ export function SplashScreen() {
     <MobileShell background="var(--color-sidebar-background)">
       <div className={styles.wrapper}>
         <SplashBackground />
+        {/* 渐变叠加层：accent → transparent (bottom-left → center-right) */}
         <div className={styles.gradientOverlay} aria-hidden="true" />
         <div className={styles.content}>
           <SplashLogo />
           <div className={styles.spacer} />
           <SplashContent />
           <div className={styles.buttonArea}>
-            <SplashButton onSkip={() => router.push(ROUTES.chat)} />
+            <SplashButton
+              onSkip={() => router.push(ROUTES.chat)}
+              onFacebookLogin={() => {
+                /* Facebook 登录触发由 SplashButton 内部 dispatch */
+              }}
+            />
           </div>
           <p className={styles.bottom}>
             Elio Silvestri, Your exclusive AI boyfriend