feat(context-menu): pass file path to NSFW level selector

- Add `cardPath` parameter to `show` method in NsfwLevelSelector component
- Include `filePath` from card dataset when calling selector in ModelContextMenuMixin
- Clear `cardPath` from dataset when hiding selector to prevent stale data

This enables the NSFW level selector to access the file path context, which may be needed for backend operations when changing NSFW levels.

static/js/components/ContextMenu/ModelContextMenuMixin.js

@@ -55,6 +55,7 @@ export const ModelContextMenuMixin = {
         const filePath = card.dataset.filepath;
         selector.show({
             currentLevel,
+            cardPath: filePath,
             onSelect: async (level) => {
                 if (!filePath) return false;
                 try {