fix: preset thumbnails no longer conflict with main preview animation

- Inject only @keyframes (not .animated class rule) per preset thumbnail
  so the main preview's .animated rule cannot override them
- Drive thumbnail animation entirely via inline style properties
- Remove isActive/currentName — presets should never appear selected

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

components/animate/AnimationEditor.tsx

@@ -98,7 +98,7 @@ export function AnimationEditor() {
       </div>
 
       {/* Row 4: Preset Library */}
-      <PresetLibrary currentName={config.name} onSelect={loadPreset} />
+      <PresetLibrary onSelect={loadPreset} />
     </div>
   );
 }