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/VirtualGallery.css

@@ -380,3 +380,42 @@
     border-bottom: 1px solid rgba(201, 169, 110, 0.25);
   }
 }
+
+.movement-hall-nav-list {
+  list-style: none;
+  margin: 0 0 20px;
+  padding: 0;
+}
+
+.movement-hall-nav-list li + li {
+  margin-top: 8px;
+}
+
+.movement-hall-nav-list button {
+  width: 100%;
+  text-align: left;
+  padding: 12px 14px;
+  border: 1px solid rgba(201, 169, 110, 0.35);
+  border-radius: 8px;
+  background: rgba(30, 24, 18, 0.6);
+  color: #e8d5b5;
+  cursor: pointer;
+}
+
+.movement-hall-nav-list button:hover,
+.movement-hall-nav-active {
+  border-color: rgba(212, 175, 55, 0.75) !important;
+  background: rgba(60, 48, 32, 0.85) !important;
+}
+
+.movement-hall-nav-list small {
+  display: block;
+  margin-top: 4px;
+  font-size: 12px;
+  opacity: 0.75;
+}
+
+.movement-hall-exit-timeline {
+  width: 100%;
+  margin-top: 8px;
+}