Align Studio display chrome to the Classic | Studio reference mock.

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

artifacts/studio2-display-ux/tokens/display.css

@@ -0,0 +1,56 @@
+/* AIGen display tokens — Classic | Studio
+   Apply on [data-display] wrapper. Do not fork components. */
+
+:root,
+[data-display="studio"] {
+  --bg: #0e0e10;
+  --bg-raise: #161618;
+  --bg-slot: #1c1c1f;
+  --line: #2a2a2e;
+  --text: #f3f1ea;
+  --muted: #9a9588;
+  --amber: #f5a524;
+  --amber-dim: #c4841c;
+  --radius: 8px;
+  --chrome-gap: 16px;
+  --rail-h: 40px;
+  --card-pad: 14px;
+  --header-h: 52px;
+  --type: 14px;
+  --type-sm: 12px;
+}
+
+[data-display="classic"] {
+  --chrome-gap: 8px;
+  --rail-h: 32px;
+  --card-pad: 10px;
+  --header-h: 44px;
+  --type: 13px;
+}
+
+[data-display] {
+  background: var(--bg);
+  color: var(--text);
+  font-size: var(--type);
+}
+
+[data-display="classic"] .rail-task,
+[data-display="classic"] .rail-model {
+  display: none;
+}
+[data-display="studio"] .classic-selects {
+  display: none;
+}
+[data-display="classic"] .identity-slots {
+  display: none;
+}
+[data-display="studio"] .identity-header {
+  display: none;
+}
+[data-display="classic"] .eye-tile,
+[data-display="classic"] .eye-viewer {
+  display: none;
+}
+[data-display="studio"] .classic-hide {
+  display: none;
+}