Workspace refresh and smoother previews

A more focused way to create

• Refreshed the workspace layout so prompts, references, and results sit in a clearer rhythm.
• Added a full-screen lightbox for generated images — pan, zoom, and step through results without losing context.
• Unified the generation waiting animation across image and video flows for a calmer, more confident feel.
• Tightened the action buttons on each result card so the next move is always one tap away.