feat(ops): health-fail alerts, optional DB backup, admin UX polish

Wire jobs-worker health probes to Discord/email alerts with cooldown, optional mysqldump, rate-limit /api/health, mark-all-read alerts, ConfirmDialog on destructive admin actions, and raise coverage floors.

Co-authored-by: Cursor <[email protected]>

src/components/admin/media-grid.tsx

@@ -3,6 +3,7 @@
 import { useTranslations } from "next-intl";
 import { useCallback, useEffect, useMemo, useRef, useState } from "react";
 import { deleteMedia, uploadMedia } from "@/actions/admin-media";
+import { useConfirmDialog } from "@/components/admin/confirm-dialog";
 import { formatDate } from "@/lib/format-date";
 
 type MediaFile = {
@@ -32,6 +33,7 @@ function extOf(name: string): string {
 
 export function AdminMediaGrid() {
 	const t = useTranslations("pages.admin.media");
+	const { confirm, dialog: confirmDialog } = useConfirmDialog();
 	const [files, setFiles] = useState<MediaFile[]>([]);
 	const [loading, setLoading] = useState(true);
 	const [uploading, setUploading] = useState(false);
@@ -103,7 +105,13 @@ export function AdminMediaGrid() {
 	}
 
 	async function remove(name: string) {
-		if (!window.confirm(t("confirmDelete"))) return;
+		const ok = await confirm({
+			title: t("delete"),
+			description: t("confirmDelete"),
+			confirmLabel: t("delete"),
+			variant: "danger",
+		});
+		if (!ok) return;
 		try {
 			await deleteMedia(name);
 			setFiles((prev) => prev.filter((f) => f.name !== name));
@@ -115,6 +123,7 @@ export function AdminMediaGrid() {
 
 	return (
 		<div className="admin-card">
+			{confirmDialog}
 			{/* Toolbar */}
 			<div className="flex flex-wrap items-center gap-3 mb-4">
 				<label className="btn btn-primary cursor-pointer text-sm">