feat: enhance blog post layout and add scroll progress indicator

- Adjusted padding for the blog post thumbnail section.
- Introduced a custom hook for tracking scroll progress.
- Added horizontal scroll progress indicators for both desktop and mobile views in the blog table of contents.

app/blog/[slug]/page.tsx

@@ -68,8 +68,8 @@ export default async function BlogPostPage({ params }: BlogPostPageProps) {
     <>
       {/* تصویر شاخص تمام‌عرض بالای صفحه */}
       {thumbnailUrl && (
-        <div className="pt-10 md:pt-24">
-          <div className="relative container mx-auto  max-w-6xl rounded-xl overflow-hidden shadow-sm w-full aspect-[5/2] min-h-[10rem] md:min-h-[10rem] bg-muted">
+        <div className="pt-13 md:pt-24">
+          <div className="relative container mx-auto  max-w-6xl md:rounded-xl overflow-hidden shadow-sm w-full aspect-[5/2] min-h-[10rem] md:min-h-[10rem] bg-muted">
             <Image
               src={thumbnailUrl}
               alt={altText}

components/blog-toc.tsx

@@ -1,6 +1,6 @@
 "use client";
 
-import { useEffect, useMemo, useState } from "react";
+import { useCallback, useEffect, useMemo, useState } from "react";
 import Link from "next/link";
 import { ChevronDown, List } from "lucide-react";
 import {
@@ -12,6 +12,33 @@ import { ScrollArea } from "@/components/ui/scroll-area";
 import { cn } from "@/lib/utils";
 import type { TocItem } from "@/lib/blog-utils";
 
+function useScrollProgress() {
+  const [progress, setProgress] = useState(0);
+
+  const update = useCallback(() => {
+    const { scrollY } = window;
+    const docHeight = document.documentElement.scrollHeight - window.innerHeight;
+    if (docHeight <= 0) {
+      setProgress(0);
+      return;
+    }
+    const value = Math.min(100, Math.max(0, (scrollY / docHeight) * 100));
+    setProgress(value);
+  }, []);
+
+  useEffect(() => {
+    update();
+    window.addEventListener("scroll", update, { passive: true });
+    window.addEventListener("resize", update);
+    return () => {
+      window.removeEventListener("scroll", update);
+      window.removeEventListener("resize", update);
+    };
+  }, [update]);
+
+  return progress;
+}
+
 interface TocGroup {
   heading: TocItem;
   children: TocItem[];
@@ -54,6 +81,7 @@ export function BlogToc({ items, className }: BlogTocProps) {
   const [activeId, setActiveId] = useState<string | null>(items[0]?.id ?? null);
   const [mobileOpen, setMobileOpen] = useState(false);
   const [openSections, setOpenSections] = useState<Set<string>>(() => new Set());
+  const scrollProgress = useScrollProgress();
 
   const groups = useMemo(() => groupByLevel2(items), [items]);
 
@@ -172,15 +200,25 @@ export function BlogToc({ items, className }: BlogTocProps) {
 
   return (
     <>
-      {/* Desktop: sticky sidebar left */}
+      {/* Desktop: sticky sidebar with scroll progress bar */}
       <aside
         className={cn(
-          "hidden lg:block shrink-0",
+          "hidden lg:block shrink-0 relative",
           "sticky top-24 self-start",
           className
         )}
       >
-        <p className="mb-3 text-xs font-semibold uppercase tracking-wider text-muted-foreground">
+        {/* Horizontal scroll progress indicator */}
+        <div
+          className="absolute -top-2 left-0 right-0 h-1 rounded-full bg-muted overflow-hidden"
+          aria-hidden
+        >
+          <div
+            className="h-full min-w-[2px] bg-primary transition-[width] duration-150 ease-out rounded-full"
+            style={{ width: `${scrollProgress}%` }}
+          />
+        </div>
+        <p className="mb-3 text-md ms-2 font-semibold uppercase tracking-wider text-muted-foreground">
           فهرست مطالب
         </p>
         <ScrollArea className="h-full pb-8" dir="rtl">
@@ -188,21 +226,32 @@ export function BlogToc({ items, className }: BlogTocProps) {
         </ScrollArea>
       </aside>
 
-      {/* Mobile: collapsible, sticky when scrolling */}
+      {/* Mobile: collapsible with horizontal scroll progress bar */}
       <Collapsible
         open={mobileOpen}
         onOpenChange={setMobileOpen}
         className={cn(
-          "lg:hidden w-full sticky top-20 z-10 bg-background",
+          "lg:hidden w-full sticky top-14 z-10 bg-background",
           className
         )}
       >
+
         <CollapsibleTrigger
           className={cn(
             "flex w-full items-center justify-between gap-2 rounded-lg border border-border bg-muted/30 px-4 py-3 text-sm font-medium transition-colors hover:bg-muted/50",
             mobileOpen && "rounded-b-none border-b-0"
           )}
         >
+          {/* Horizontal scroll progress indicator (mobile) */}
+          <div
+            className="absolute right-1 top-1 inset-inline-0 h-1 w-[97%] bg-muted overflow-hidden rounded-full"
+            aria-hidden
+          >
+            <div
+              className="h-full bg-primary transition-[width] duration-150 ease-out rounded-full"
+              style={{ width: `${scrollProgress}%` }}
+            />
+          </div>
           <span className="flex items-center gap-2">
             <List className="size-4 text-muted-foreground" />
             فهرست مطالب