fix(frontend): add blog admin preview route

src/app/admin/blog/[id]/preview/page.tsx

@@ -0,0 +1,8 @@
+import AdminBlogPreview from "@/views/AdminBlogPreview";
+
+type Params = Promise<{ id: string }>;
+
+export default async function AdminBlogPreviewPage({ params }: { params: Params }) {
+  const { id } = await params;
+  return <AdminBlogPreview postId={Number(id)} />;
+}

src/views/AdminBlog.tsx

@@ -146,7 +146,7 @@ export default function AdminBlog() {
               <div key={post.id} className="flex flex-col gap-3 rounded-2xl border p-4 md:flex-row md:items-center md:justify-between">
                 <div className="flex flex-wrap gap-2">
                   <Button variant="outline" size="sm" asChild>
-                    <Link to={`/blog/${post.slug}`}><Eye className="ml-2 h-4 w-4" />مشاهده</Link>
+                    <Link to={`/admin/blog/${post.id}/preview`}><Eye className="ml-2 h-4 w-4" />پیش‌نمایش</Link>
                   </Button>
                   <Button variant="secondary" size="sm" asChild>
                     <Link to={`/admin/blog/${post.id}/edit`}><Edit className="ml-2 h-4 w-4" />ویرایش</Link>

src/views/AdminBlogPreview.tsx

@@ -0,0 +1,172 @@
+"use client";
+
+import { useEffect, useMemo, useState } from "react";
+import { ArrowRight, Edit, ExternalLink, Loader2 } from "lucide-react";
+import Markdown from "@/components/Markdown";
+import { Badge } from "@/components/ui/badge";
+import { Button } from "@/components/ui/button";
+import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
+import { api } from "@/lib/api";
+import { Link } from "@/lib/router";
+import { apiBaseUrl, toAbsoluteUrl } from "@/lib/site";
+import type * as Types from "@/lib/types";
+import { formatJalali, resolveErrorMessage } from "@/lib/utils";
+
+type Props = {
+  postId: number;
+};
+
+const statusLabels: Record<string, string> = {
+  draft: "پیش‌نویس",
+  submitted: "در انتظار بررسی",
+  changes_requested: "نیازمند اصلاح",
+  published: "منتشر شده",
+  archived: "آرشیو شده",
+};
+
+export default function AdminBlogPreview({ postId }: Props) {
+  const [post, setPost] = useState<Types.PostDetailSchema | null>(null);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState<string | null>(null);
+
+  useEffect(() => {
+    if (!Number.isFinite(postId)) {
+      setError("شناسه نوشته نامعتبر است.");
+      setLoading(false);
+      return;
+    }
+
+    let isMounted = true;
+    setLoading(true);
+    setError(null);
+
+    api.getAdminBlogPost(postId)
+      .then((data) => {
+        if (isMounted) setPost(data);
+      })
+      .catch((err) => {
+        if (isMounted) {
+          setError(resolveErrorMessage(err, "نوشته برای پیش‌نمایش یافت نشد."));
+        }
+      })
+      .finally(() => {
+        if (isMounted) setLoading(false);
+      });
+
+    return () => {
+      isMounted = false;
+    };
+  }, [postId]);
+
+  const image = useMemo(() => {
+    if (!post) return undefined;
+    return toAbsoluteUrl(
+      post.og_image_url || post.absolute_featured_image_url || post.featured_image,
+      apiBaseUrl,
+    );
+  }, [post]);
+
+  if (loading) {
+    return (
+      <div className="flex min-h-[50vh] items-center justify-center" dir="rtl">
+        <Loader2 className="h-6 w-6 animate-spin text-primary" />
+      </div>
+    );
+  }
+
+  if (error || !post) {
+    return (
+      <div className="container mx-auto px-4 py-8" dir="rtl">
+        <Card>
+          <CardHeader className="text-right">
+            <CardTitle>پیش‌نمایش نوشته در دسترس نیست</CardTitle>
+            <CardDescription>{error}</CardDescription>
+          </CardHeader>
+          <CardContent>
+            <Button asChild variant="outline">
+              <Link to="/admin/blog">
+                <ArrowRight className="ml-2 h-4 w-4" />
+                بازگشت به مدیریت بلاگ
+              </Link>
+            </Button>
+          </CardContent>
+        </Card>
+      </div>
+    );
+  }
+
+  return (
+    <div className="min-h-screen bg-background" dir="rtl">
+      <div className="container mx-auto px-4 py-8">
+        <div className="mb-6 flex flex-col gap-3 md:flex-row md:items-center md:justify-between">
+          <div className="flex flex-wrap gap-2">
+            <Button asChild variant="outline">
+              <Link to="/admin/blog">
+                <ArrowRight className="ml-2 h-4 w-4" />
+                بازگشت
+              </Link>
+            </Button>
+            <Button asChild variant="secondary">
+              <Link to={`/admin/blog/${post.id}/edit`}>
+                <Edit className="ml-2 h-4 w-4" />
+                ویرایش
+              </Link>
+            </Button>
+            {post.status === "published" && post.slug ? (
+              <Button asChild>
+                <Link to={`/blog/${post.slug}`}>
+                  <ExternalLink className="ml-2 h-4 w-4" />
+                  نسخه عمومی
+                </Link>
+              </Button>
+            ) : null}
+          </div>
+          <div className="text-right">
+            <Badge variant={post.status === "published" ? "default" : "secondary"}>
+              {statusLabels[post.status] ?? post.status}
+            </Badge>
+            <p className="mt-1 text-xs text-muted-foreground">
+              آخرین به‌روزرسانی: {formatJalali(post.updated_at, false)}
+            </p>
+          </div>
+        </div>
+
+        {post.status !== "published" ? (
+          <div className="mb-4 rounded-2xl border border-amber-200 bg-amber-50 p-4 text-right text-sm text-amber-900 dark:border-amber-900/50 dark:bg-amber-950/30 dark:text-amber-100">
+            این نسخه پیش‌نمایش داخلی است و تا زمان انتشار در صفحه عمومی وبلاگ دیده نمی‌شود.
+          </div>
+        ) : null}
+
+        <Card>
+          {image ? (
+            <div className="aspect-video w-full overflow-hidden rounded-t-lg bg-muted">
+              <img src={image} alt={post.title} className="h-full w-full object-cover" />
+            </div>
+          ) : null}
+          <CardHeader>
+            <div className="flex flex-wrap gap-2">
+              {post.category?.name ? <Badge variant="secondary">{post.category.name}</Badge> : null}
+              {post.tags.map((tag) => (
+                <Badge key={tag.id} variant="outline">
+                  {tag.name}
+                </Badge>
+              ))}
+            </div>
+            <CardTitle className="text-3xl leading-relaxed">{post.title}</CardTitle>
+            <CardDescription className="text-sm">
+              نویسنده: {[post.author.first_name, post.author.last_name].filter(Boolean).join(" ") || post.author.username}
+            </CardDescription>
+          </CardHeader>
+          <CardContent className="space-y-6">
+            {post.excerpt ? (
+              <p className="rounded-lg border bg-muted/30 p-4 text-sm leading-7 text-muted-foreground">
+                {post.excerpt}
+              </p>
+            ) : null}
+            <Markdown content={post.content} justify size="base" />
+          </CardContent>
+        </Card>
+      </div>
+    </div>
+  );
+}