fix(unity-bootstrap-theme): improve hero small button positioning

[juanmitriatti]

Description

Problem:
The uds-hero-sm component uses absolute positioning for buttons, which causes overlap issues with
header content when text is long or on small screens. The fixed top: 14.5rem value doesn't adapt
to different content sizes.
This issue is reported at : https://asudev.jira.com/browse/WS2-2385
Solution:

• Changed button positioning from position: absolute to position: relative
• Updated grid layout from grid-template-rows: 1fr auto auto $uds-size-spacing-7 to
  grid-template-rows: 0px 1fr 0px auto
• Set buttons to use grid-row: 4 for proper grid placement
• Added margin-top: 1rem to .has-btn-row .btn-row for better spacing
• Buttons now flow naturally within the grid instead of using fixed positioning

Testing Steps:

1. Build the package: cd packages/unity-bootstrap-theme && yarn build
2. Start Storybook: yarn storybook
3. Navigate to "Molecules/Heroes/Examples" → "Hero Small With Buttons"
4. Verify buttons are positioned correctly without overlapping content (Also, try zooming in until 200%)
5. Test with long headings (2-3 lines) to ensure no overlap occurs
6. Test responsive behavior on mobile, tablet, and desktop viewports
7. Verify both single button and button row scenarios work correctly

Checklist

• Tests pass for relevant code changes

Important Reminders

Links

• JIRA ticket
• Unity reference site
• UDS Guidelines

[asu-jenkins-devops]

Storybook deployed at https://unity-uds-staging.s3.us-west-2.amazonaws.com/pr-1625/index.html

[davidornelas11]

Looks like there are some styling issues with the changes and the header

[juanmitriatti]

Looks like there are some styling issues with the changes and the header

This is ready to review again. Thanks @davidornelas11

[davidornelas11]

Looks like there are some styling issues with the changes and the header

This is ready to review again. Thanks @davidornelas11

Nice! Im gonna test it in webspark just to double check

[davidornelas11]

Looks good in storybook now!