Button Styling:
- Buttons now render as simple links with 🔘 prefix in editor
- No more styled button appearance in TipTap (was inconsistent)
- Actual button styling still happens in email (EmailRenderer.php)
Click-to-Edit:
- Click any button in the editor to open edit dialog
- Edit button text, link URL, and style (solid/outline)
- Delete button option in edit mode
- Updates button in-place instead of requiring recreation
Dialog improvements:
- Shows 'Edit Button' title in edit mode
- Shows 'Update Button' vs 'Insert Button' based on mode
- Delete button (red) appears only in edit mode
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