feat(canvas): collect generated images and videos in My Works drawer

shared/image-workspace.ts

@@ -276,6 +276,22 @@ export type DesignAsset = {
   contentPath: string;
 };
 
+export type DesignGeneratedWork = {
+  asset: DesignAsset;
+  workspaceTitle: string;
+  taskId: string;
+  title: string;
+};
+
+/** One page scans Workspace summaries; nextOffset is a Workspace offset. */
+export type DesignGeneratedWorksPage = {
+  works: DesignGeneratedWork[];
+  nextOffset: number | null;
+  unavailableWorkspaceIds: string[];
+  /** The upstream detail API limits each Workspace's assets and task history. */
+  historyTruncated: boolean;
+};
+
 export type DesignTaskProgress = {
   stage:
     | 'queued'