mqtt webhook: nest under jellyfin card, strict enable gating, end-to-end test

- MqttSection now renders as a nested block inside the Jellyfin
  ConnSection instead of its own card; ConnSection grew a children slot
- when the enable checkbox is off, broker/topic/credentials inputs and
  the whole plugin setup panel are hidden; only the toggle + a small
  save button remain
- 'Test Connection' became 'Test end-to-end': connects to the broker,
  subscribes, picks a random scanned movie/episode, asks jellyfin to
  refresh it, and waits for a matching webhook message. the UI walks
  through all three steps (broker reachable → jellyfin rescan triggered
  → webhook received) with per-step success/failure so a broken
  plugin config is obvious

server/api/settings.ts

@@ -1,6 +1,6 @@
 import { Hono } from "hono";
 import { getAllConfig, getConfig, getDb, getEnvLockedKeys, reseedDefaults, setConfig } from "../db/index";
-import { getUsers, testConnection as testJellyfin } from "../services/jellyfin";
+import { getUsers, refreshItem, testConnection as testJellyfin } from "../services/jellyfin";
 import { getMqttStatus, startMqttClient, testMqttConnection } from "../services/mqtt";
 import { testConnection as testRadarr } from "../services/radarr";
 import { getScheduleConfig, type ScheduleConfig, updateScheduleConfig } from "../services/scheduler";
@@ -145,7 +145,31 @@ app.post("/mqtt/test", async (c) => {
 	const topic = (body.topic ?? "jellyfin/events").trim() || "jellyfin/events";
 	const password = body.password || getConfig("mqtt_password") || "";
 
-	const result = await testMqttConnection({ url, topic, username: (body.username ?? "").trim(), password }, 15_000);
+	const jellyfinUrl = getConfig("jellyfin_url") ?? "";
+	const jellyfinApiKey = getConfig("jellyfin_api_key") ?? "";
+	const jellyfinUserId = getConfig("jellyfin_user_id") ?? "";
+	const jfCfg = { url: jellyfinUrl, apiKey: jellyfinApiKey, userId: jellyfinUserId };
+
+	const triggerRefresh = async (): Promise<{ itemId: string; itemName: string } | null> => {
+		if (!jellyfinUrl || !jellyfinApiKey) return null;
+		// Grab any scanned movie/episode as the trigger target. Random ordering
+		// so repeated tests don't keep hammering the same item.
+		const row = getDb()
+			.prepare("SELECT jellyfin_id, name FROM media_items WHERE type IN ('Movie', 'Episode') ORDER BY RANDOM() LIMIT 1")
+			.get() as { jellyfin_id: string; name: string } | undefined;
+		if (!row) return null;
+		// Fire-and-poll: refreshItem blocks until Jellyfin finishes, which we
+		// don't want here — the webhook fires during the refresh itself.
+		// Kick it off in the background; the mqtt subscriber catches the event.
+		refreshItem(jfCfg, row.jellyfin_id, 2_000).catch(() => {});
+		return { itemId: row.jellyfin_id, itemName: row.name };
+	};
+
+	const result = await testMqttConnection(
+		{ url, topic, username: (body.username ?? "").trim(), password },
+		triggerRefresh,
+		30_000,
+	);
 	return c.json(result);
 });