feat(assets): add initial fonts and image assets

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

@@ -1,18 +1,27 @@
 "use client";
 /**
- * Splash 内容文案
+ * Splash 主内容文案
  *
  * 原始 Dart: lib/ui/splash/widgets/splash_content.dart
+ *
+ * 关键差异：
+ *   - 使用 Athelas 字体（衬线体）
+ *   - 标题加粗 + 斜体（与原 Dart 一致）
+ *   - 颜色：白色（背景图上需高对比度）
  */
 import styles from "./splash-content.module.css";
 
+const APOSTROPHE = "'";
+
 export function SplashContent() {
   return (
     <div className={styles.content}>
-      <h1 className={styles.title}>Chat with Elio, anytime, anywhere</h1>
-      <p className={styles.subtitle}>
-        A safe, private space to talk, share, and unwind — your AI companion who&apos;s always there.
-      </p>
+      <h1 className={styles.title}>
+        Welcome to my secret hideout~
+        {"\n"}It{APOSTROPHE}s just the two of us now.
+        {"\n"}Feel free to whisper your
+        {"\n"}little secrets.
+      </h1>
     </div>
   );
 }