fix(studio): capture storyboard tiles at review density (#3371)

* fix(studio): capture storyboard tiles at source resolution

* fix(studio): bound storyboard tile captures

packages/studio/src/player/components/CompositionThumbnail.test.ts

@@ -87,6 +87,9 @@ describe("buildCompositionThumbnailUrl", () => {
 
     expect(buildCompositionThumbnailUrl(base)).not.toContain("output=");
     expect(buildCompositionThumbnailUrl({ ...base, output: "source" })).toContain("output=source");
+    expect(buildCompositionThumbnailUrl({ ...base, output: "storyboard" })).toContain(
+      "output=storyboard",
+    );
   });
 });
 

packages/studio/src/player/components/CompositionThumbnail.tsx

@@ -42,10 +42,10 @@ export function buildCompositionThumbnailUrl({
   /**
    * Capture density. Omitted, the route bounds the image to its preview cap —
    * right for the timeline, where thumbnails are small and numerous and their
-   * decoded bytes are budgeted. `"source"` captures at the composition's own
-   * dimensions, for the rare surface that shows one poster large enough to read.
+   * decoded bytes are budgeted. `"storyboard"` caps the longest side at a
+   * high-density review size; `"source"` uses the composition's own dimensions.
    */
-  output?: "source";
+  output?: "source" | "storyboard";
 }): string {
   const thumbnailBase = previewUrl
     .replace("/preview/comp/", "/thumbnail/")