Phase 1: Model Modal Split-View Redesign

- Implement new split-view overlay layout (left showcase, right metadata)
- Add keyboard navigation (↑↓ for model, ←→ for examples, ESC to close)
- Create Thumbnail Rail for quick example navigation
- Add image controls (view params, set preview, delete)
- Implement parameter panel with prompt display
- Add metadata panel with model info, tags, licenses
- Create tabs (Description/Versions/Recipes) with accordion content
- Integrate with existing ModelCard click handlers
- Add first-use keyboard hint overlay

New files:
- static/js/components/model-modal/*.js
- static/css/components/model-modal/*.css
- docs/plan/model-modal-redesign.md

static/js/components/model-modal/index.js

@@ -0,0 +1,16 @@
+/**
+ * Model Modal - New Split-View Overlay Design
+ * Phase 1 Implementation
+ */
+
+import { ModelModal } from './ModelModal.js';
+
+// Export the public API
+export const modelModal = {
+  show: ModelModal.show.bind(ModelModal),
+  close: ModelModal.close.bind(ModelModal),
+  isOpen: ModelModal.isOpen.bind(ModelModal),
+};
+
+// Default export for convenience
+export default modelModal;