ML-194: add selective smoke coverage

Add smoke tests for bulk cron workers, CSP browser header, and
on_mount hooks (GetTimezone/StaticAssets). 9 tests across 4 files,
all passing alongside 135 existing related tests.

test/music_library/worker/bulk_cron_workers_test.exs

@@ -0,0 +1,72 @@
+defmodule MusicLibrary.Worker.BulkCronWorkersTest do
+  use MusicLibrary.DataCase
+
+  import MusicLibrary.Fixtures.Records
+
+  alias MusicLibrary.Worker.ArtistRefreshAllDiscogsData
+  alias MusicLibrary.Worker.ArtistRefreshAllMusicBrainzData
+  alias MusicLibrary.Worker.ArtistRefreshAllWikipediaData
+  alias MusicLibrary.Worker.RecordGenerateAllEmbeddings
+  alias MusicLibrary.Worker.RecordRefreshAllMusicBrainzData
+
+  describe "RecordRefreshAllMusicBrainzData" do
+    test "enqueues per-record MusicBrainz refresh jobs" do
+      rec = record()
+
+      assert {:ok, []} = perform_job(RecordRefreshAllMusicBrainzData, %{})
+
+      assert_enqueued worker: MusicLibrary.Worker.RecordRefreshMusicBrainzData,
+                      args: %{id: rec.id}
+    end
+  end
+
+  describe "RecordGenerateAllEmbeddings" do
+    test "enqueues per-record embedding generation jobs" do
+      rec = record()
+
+      assert {:ok, []} = perform_job(RecordGenerateAllEmbeddings, %{})
+
+      assert_enqueued worker: MusicLibrary.Worker.GenerateRecordEmbedding,
+                      args: %{record_id: rec.id}
+    end
+  end
+
+  describe "ArtistRefreshAllMusicBrainzData" do
+    test "enqueues per-artist MusicBrainz refresh jobs" do
+      rec = record()
+      artist = hd(rec.artists)
+      info = artist_info(artist.musicbrainz_id)
+
+      assert {:ok, []} = perform_job(ArtistRefreshAllMusicBrainzData, %{})
+
+      assert_enqueued worker: MusicLibrary.Worker.ArtistRefreshMusicBrainzData,
+                      args: %{id: info.id}
+    end
+  end
+
+  describe "ArtistRefreshAllDiscogsData" do
+    test "enqueues per-artist Discogs refresh jobs" do
+      rec = record()
+      artist = hd(rec.artists)
+      info = artist_info(artist.musicbrainz_id)
+
+      assert {:ok, []} = perform_job(ArtistRefreshAllDiscogsData, %{})
+
+      assert_enqueued worker: MusicLibrary.Worker.ArtistRefreshDiscogsData,
+                      args: %{id: info.id}
+    end
+  end
+
+  describe "ArtistRefreshAllWikipediaData" do
+    test "enqueues per-artist Wikipedia refresh jobs" do
+      rec = record()
+      artist = hd(rec.artists)
+      info = artist_info(artist.musicbrainz_id)
+
+      assert {:ok, []} = perform_job(ArtistRefreshAllWikipediaData, %{})
+
+      assert_enqueued worker: MusicLibrary.Worker.ArtistRefreshWikipediaData,
+                      args: %{id: info.id}
+    end
+  end
+end