Scene strip tile artwork + on-air indicator (creator ruling 2026-10-10). Top-bar tiles now carry their own art: each canonical scene's tile is a per-scene CRT-styled image stored in the internal DB (Scene.ThumbnailAssetId - additive migration, seeded at heal from the creator's five Downloads JPGs via SceneThumbnailSeedPaths), and the preview pane keeps rendering the scene's ORIGINAL background - never the tiles. One shared on-air image (Gemini 4zajyl...jpg) replaces the staged scene's tile and follows the scene swap ('the on-air screen jumps around the top bar as the user swaps scenes'): stored as an Asset BLOB tracked by the OnAirImageAssetId Setting (EnsureOnAirImage, same contract as the alert clip) with MainViewModel.OnAirSeedPath override; RefreshSnapshotsAsync shows it for the staged scene, otherwise thumbnail-or-background art, and a staged Live with no on-air art still falls back to the green placeholder (minis never render live captures). Removed the 6px #22c55e rectangle in PreviewPane's backdrop ('green outline around the preview screen' that surfaced when a scene had no background) - the outer PreviewGlow red border is the real live signal. Doubled the scene-tile labels (FontSize 10 -> 20). Fixed a real bug this surfaced: Save()'s Asset pruner only kept Source/alert-clip rows, so the first save would have DELETED the seeded tile + on-air assets - the keep-set now includes Scene.ThumbnailAssetId and the OnAirImageAssetId Setting. New Settings/Load/Save migrations + SceneThumbnailTests (4 tests: seeded tile in strip, preview keeps original bg, Live-staged tile, no-seed fallback, on-air swap + persistence). 427 pass, 0 build warnings. (Unit: strip tiles + on-air)

Services/LayoutStore.Load.cs

@@ -16,7 +16,7 @@ public partial class LayoutStore : IDisposable
 
         using (var cmd = _connection.CreateCommand())
         {
-            cmd.CommandText = "SELECT Id, Name, IsHidden, IsChatScene, HasBackground, HasSocialBar FROM Scene ORDER BY SortOrder";
+            cmd.CommandText = "SELECT Id, Name, IsHidden, IsChatScene, HasBackground, HasSocialBar, ThumbnailAssetId FROM Scene ORDER BY SortOrder";
             using var reader = cmd.ExecuteReader();
             while (reader.Read())
             {
@@ -28,6 +28,7 @@ public partial class LayoutStore : IDisposable
                     IsChatScene = reader.GetInt32(3) != 0,
                     HasBackground = reader.GetInt32(4) != 0,
                     HasSocialBar = reader.FieldCount > 5 && !reader.IsDBNull(5) && reader.GetInt32(5) != 0,
+                    ThumbnailAssetId = reader.FieldCount > 6 && !reader.IsDBNull(6) ? reader.GetString(6) : null,
                 });
             }
         }

Services/LayoutStore.Migrations.cs

@@ -138,6 +138,7 @@ public partial class LayoutStore : IDisposable
         MigrateWebcamConfigTable();
         MigrateSceneTable();
         MigrateSceneSocialBarColumn();
+        MigrateSceneThumbnailColumn();
         MigrateSocialsTable();
         MigrateSocialEntryTable();
         if (GetUserVersion() < 3)
@@ -527,6 +528,27 @@ public partial class LayoutStore : IDisposable
         alter.ExecuteNonQuery();
     }
 
+    // 2026-10-10: Scene gains ThumbnailAssetId (the top-strip tile artwork, stored
+    // as an Asset row like every image). Additive, no version bump — old DBs just
+    // get a NULL column and the strip falls back to the scene's background art.
+    private void MigrateSceneThumbnailColumn()
+    {
+        var columns = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
+        using (var cmd = _connection.CreateCommand())
+        {
+            cmd.CommandText = "PRAGMA table_info(Scene);";
+            using var reader = cmd.ExecuteReader();
+            while (reader.Read())
+                columns.Add(reader.GetString(1));
+        }
+
+        if (columns.Contains("ThumbnailAssetId")) return;
+
+        using var alter = _connection.CreateCommand();
+        alter.CommandText = "ALTER TABLE Scene ADD COLUMN ThumbnailAssetId TEXT;";
+        alter.ExecuteNonQuery();
+    }
+
     // v7 → v8: Socials gains BarEnabled (the dialog's show/hide switch). The old
     // BarJustify column stays for back-compat but is no longer read or written.
     private void MigrateSocialsTable()

Services/LayoutStore.Save.cs

@@ -54,8 +54,8 @@ public partial class LayoutStore : IDisposable
         using (var cmd = _connection.CreateCommand())
         {
             cmd.CommandText = """
-                INSERT INTO Scene (Id, Name, IsHidden, IsChatScene, HasBackground, HasSocialBar, SortOrder)
-                VALUES ($id, $name, $isHidden, $isChat, $hasBackground, $hasSocialBar, $sort)
+                INSERT INTO Scene (Id, Name, IsHidden, IsChatScene, HasBackground, HasSocialBar, ThumbnailAssetId, SortOrder)
+                VALUES ($id, $name, $isHidden, $isChat, $hasBackground, $hasSocialBar, $thumbnail, $sort)
                 """;
             cmd.Transaction = tx;
             var idP = cmd.Parameters.Add("$id", SqliteType.Text);
@@ -64,6 +64,7 @@ public partial class LayoutStore : IDisposable
             var chatP = cmd.Parameters.Add("$isChat", SqliteType.Integer);
             var backgroundP = cmd.Parameters.Add("$hasBackground", SqliteType.Integer);
             var socialBarP = cmd.Parameters.Add("$hasSocialBar", SqliteType.Integer);
+            var thumbnailP = cmd.Parameters.Add("$thumbnail", SqliteType.Text);
             var sortP = cmd.Parameters.Add("$sort", SqliteType.Integer);
 
             var sort = 0;
@@ -75,6 +76,7 @@ public partial class LayoutStore : IDisposable
                 chatP.Value = scene.IsChatScene ? 1 : 0;
                 backgroundP.Value = scene.HasBackground ? 1 : 0;
                 socialBarP.Value = scene.HasSocialBar ? 1 : 0;
+                thumbnailP.Value = (object?)scene.ThumbnailAssetId ?? DBNull.Value;
                 sortP.Value = sort++;
                 cmd.ExecuteNonQuery();
             }
@@ -324,9 +326,13 @@ public partial class LayoutStore : IDisposable
                 DELETE FROM Asset WHERE Id NOT IN (
                     SELECT AssetId FROM Source WHERE AssetId IS NOT NULL
                     UNION
+                    SELECT ThumbnailAssetId FROM Scene WHERE ThumbnailAssetId IS NOT NULL
+                    UNION
                     SELECT AlertVideoAssetId FROM Source WHERE AlertVideoAssetId IS NOT NULL
                     UNION
                     SELECT Value FROM Settings WHERE Key = 'AlertDefaultVideoAssetId'
+                    UNION
+                    SELECT Value FROM Settings WHERE Key = 'OnAirImageAssetId'
                 );
                 """;
             cmd.Transaction = tx;

Services/LayoutStore.Settings.cs

@@ -326,4 +326,26 @@ public partial class LayoutStore : IDisposable
 
     /// <summary>The stored default clip's Asset id, or null when never stamped.</summary>
     public string? GetAlertDefaultVideoId() => GetSetting(AlertDefaultVideoKey);
+
+    internal const string OnAirImageKey = "OnAirImageAssetId";
+
+    /// <summary>The strip tile that labels the scene currently PREVIEWED (creator
+    /// ruling 2026-10-10 — the "on-air background screen"). One shared image, not
+    /// per-scene: whichever scene is staged shows it in the top bar, so it "jumps
+    /// around" as the creator swaps scenes. Lives as a BLOB in the internal Asset
+    /// table, tracked by this Setting so the Save pruner keeps it alive — the same
+    /// contract as the alert default clip. <c>UpsertAsset</c> is hash-keyed, so
+    /// re-stamping the same bytes returns the same id.</summary>
+    public string EnsureOnAirImage(byte[] data)
+    {
+        var saved = GetSetting(OnAirImageKey);
+        if (!string.IsNullOrWhiteSpace(saved) && GetAssetBytes(saved) != null)
+            return saved;
+        var id = UpsertAsset(data, 0, 0);
+        UpsertSetting(OnAirImageKey, id);
+        return id;
+    }
+
+    /// <summary>The stored on-air image's Asset id, or null when never stamped.</summary>
+    public string? GetOnAirImageId() => GetSetting(OnAirImageKey);
 }