- Default view: processed image (full size in dialog), or placeholder if
not yet processed. Name and type selector always visible at top.
- "Adjust corners…" button reveals the canvas editor (lazy-loaded on
first click, so there's no canvas allocation cost on open).
- "← Back to image" returns to the image view.
- Corners are only re-processed on Save if the canvas was opened.
- Tabs reduced to Fields | Contents (Corners is no longer a tab).
- Added preview image CSS; btn-link style for the back button.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>