Add movement gallery wings with period interiors and expand timeline features.

Movement galleries split large catalogs into chronological wings (~55 works), use era-themed 3D interiors with side-wall windows, wing navigator on the back exit, and front archways between wings. Also adds painting annotations, timeline event guides, portrait hover highlights, and documentation/API updates.

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

client/src/components/PaintingDetail.css

@@ -392,6 +392,11 @@
   user-select: none;
 }
 
+.painting-frame-large .painting-frame-image-wrap img {
+  width: 100%;
+  display: block;
+}
+
 .painting-description {
   max-width: 700px;
   margin-top: 20px;