The theme only defines danger/warning/success as flat colors plus -50/-100/-700
shades. bg-danger-600 and bg-warning-600 don't exist so those buttons rendered
with a transparent background, making white text invisible until hover revealed
bg-danger-700. Replaced with bg-danger / bg-warning which are defined.
Also fixed border-danger-200/400 and text-danger-600 (undefined) on the
Delete and Confirm Delete buttons.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
