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.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;