fix: Prevent grid blowout on Firefox with table in wizard

[avinashbot]

Description

Does what it says on the tin. When the refresh wizard collapses to a 1-column view in responsive situations, everything gets shifted to the first column. This changes the column widths so that the the contents are always rendered in a minmax(0, 1fr).

Related links, issue #, if available: AWSUI-19794

How has this been tested?

Visual tests, and manual checks on all browsers. We have screenshots for this but it looks like this issue was missed.

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov]

Codecov Report

Base: 92.41% // Head: 92.40% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (d03b5c9) compared to base (59a1797).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #559      +/-   ##
==========================================
- Coverage   92.41%   92.40%   -0.01%     
==========================================
  Files         569      571       +2     
  Lines       16235    16218      -17     
  Branches     4445     4443       -2     
==========================================
- Hits        15003    14986      -17     
  Misses       1149     1149              
  Partials       83       83              

Impacted Files	Coverage Δ
src/split-panel/index.tsx	94.95% <0.00%> (-1.86%)	⬇️
src/top-navigation/parts/utility.tsx	97.22% <0.00%> (-0.08%)	⬇️
src/app-layout/index.tsx	92.30% <0.00%> (ø)
src/button-dropdown/internal.tsx	100.00% <0.00%> (ø)
src/internal/context/split-panel-context.ts	50.00% <0.00%> (ø)
src/app-layout/visual-refresh/split-panel.tsx	92.98% <0.00%> (ø)
src/split-panel/side.tsx	100.00% <0.00%> (ø)
src/split-panel/bottom.tsx	100.00% <0.00%> (ø)

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