feat(dashboard): "My Renders" page for users

- /dashboard/renders: user's own render jobs (live status + progress bar + cancel)
  and finished exports (thumbnail + size/duration + download); bilingual fa/en
- server lib my-renders.ts (user-scoped /v1/renders + /v1/exports via session JWT)
- user action routes: POST /api/renders/[id]/cancel, GET /api/exports/[id]/download
  (presigned URL)
- dashboard sidebar: "رندرهای من / My Renders" nav item

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/[locale]/dashboard/renders/page.tsx

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+import type { Metadata } from "next";
+
+import { MyRenders } from "@/components/dashboard/MyRenders";
+import { ACTIVE_STEPS, listMyExports, listMyRenders } from "@/lib/api/my-renders";
+import { createPageMetadata } from "@/lib/metadata";
+
+export const metadata: Metadata = createPageMetadata({
+  title: "My Renders",
+  description: "Your render jobs and finished videos.",
+  path: "/dashboard/renders",
+});
+
+export const dynamic = "force-dynamic";
+
+export default async function MyRendersPage() {
+  const [allJobs, exports] = await Promise.all([listMyRenders(), listMyExports()]);
+  // Show active/failed jobs in the "processing" section; Done ones live as exports.
+  const jobs = allJobs.filter((j) => ACTIVE_STEPS.has(j.step) || j.step === "Failed");
+  return <MyRenders jobs={jobs} exports={exports} />;
+}

src/app/api/exports/[exportId]/download/route.ts

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+import { type NextRequest, NextResponse } from "next/server";
+import { gatewayUrl } from "@/lib/api/gateway";
+import { getAccessToken } from "@/lib/auth/session";
+
+export const runtime = "nodejs";
+interface Ctx { params: { exportId: string } }
+
+/** Return a short-lived presigned download URL for the caller's own export. */
+export async function GET(_req: NextRequest, { params }: Ctx) {
+  const token = await getAccessToken();
+  if (!token) return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+  const res = await fetch(gatewayUrl(`/v1/exports/${params.exportId}/download-url`), {
+    cache: "no-store",
+    headers: { Authorization: `Bearer ${token}`, Accept: "application/json" },
+  });
+  const data = await res.json().catch(() => null);
+  if (!res.ok) return NextResponse.json({ error: data?.message ?? "Download failed" }, { status: res.status });
+  return NextResponse.json(data ?? {});
+}

src/app/api/renders/[jobId]/cancel/route.ts

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+import { type NextRequest, NextResponse } from "next/server";
+import { gatewayUrl } from "@/lib/api/gateway";
+import { getAccessToken } from "@/lib/auth/session";
+
+export const runtime = "nodejs";
+interface Ctx { params: { jobId: string } }
+
+/** Cancel the caller's own render job (user-scoped). */
+export async function POST(_req: NextRequest, { params }: Ctx) {
+  const token = await getAccessToken();
+  if (!token) return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+  const res = await fetch(gatewayUrl(`/v1/renders/${params.jobId}/cancel`), {
+    method: "POST",
+    cache: "no-store",
+    headers: { Authorization: `Bearer ${token}`, "Content-Type": "application/json" },
+  });
+  const data = await res.json().catch(() => null);
+  if (!res.ok) return NextResponse.json({ error: data?.message ?? "Cancel failed" }, { status: res.status });
+  return NextResponse.json(data ?? { ok: true });
+}