Improve movement flow layout/animation and fix Byzantine hall doors, styles, and preload.

Co-authored-by: Cursor <cursoragent@cursor.com>

client/src/api/client.ts

@@ -302,6 +302,15 @@ export async function preloadArtistImages(artistId: number): Promise<{ fetched:
   return res.json();
 }
 
+export async function preloadMovementImages(movementId: number): Promise<{ fetched: number; total: number }> {
+  const res = await fetch(`${API}/movements/${movementId}/preload-images`, {
+    ...fetchCredentials,
+    method: 'POST',
+  });
+  if (!res.ok) throw new Error('Preload failed');
+  return res.json();
+}
+
 export interface FixPaintingImageResult {
   imagePath: string | null;
   thumbnailPath: string | null;
@@ -864,6 +873,7 @@ export const api = {
     }),
 
   preloadArtistImages,
+  preloadMovementImages,
 };
 
 export interface TranslationWorklistItem {