- Remove all action buttons from thumbnail overlay
- Keep only provider tag and delete button (X)
- Keep prompt text visible on hover
- All actions (download, video, remix, etc.) now in lightbox
- Remove Video button from PromptHero (generate images first, video from gallery)
- Add Meta AI image-to-video in Gallery component
- Redesign lightbox with split panel layout (image left, controls right)
- Add handleGenerateMetaVideo() for Meta AI video from gallery
- Fix reference buttons (all disabled for Meta AI)
- Lightbox now shows: Download, Generate Video, Remix/Edit, Copy Prompt, Delete
