fix(frontend): 移除易被误认为加载条的顶部阅读进度条

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/components/ReadingProgress.tsx

@@ -1,37 +0,0 @@
-"use client";
-
-import { useEffect, useState } from "react";
-
-export default function ReadingProgress() {
-  const [progress, setProgress] = useState(0);
-
-  useEffect(() => {
-    let raf = 0;
-    const update = () => {
-      raf = 0;
-      const doc = document.documentElement;
-      const max = doc.scrollHeight - doc.clientHeight;
-      setProgress(max > 0 ? Math.min(1, doc.scrollTop / max) : 0);
-    };
-    const onScroll = () => {
-      if (!raf) raf = requestAnimationFrame(update);
-    };
-    update();
-    window.addEventListener("scroll", onScroll, { passive: true });
-    window.addEventListener("resize", onScroll);
-    return () => {
-      window.removeEventListener("scroll", onScroll);
-      window.removeEventListener("resize", onScroll);
-      if (raf) cancelAnimationFrame(raf);
-    };
-  }, []);
-
-  if (progress <= 0) return null;
-  return (
-    <div
-      className="reading-progress"
-      style={{ transform: `scaleX(${progress})`, opacity: progress >= 1 ? 0 : 1 }}
-      aria-hidden="true"
-    />
-  );
-}