Fix flaky slider Cypress test

[kswenson]

Summary

• Close the inspector palette after setting the animation rate in setAnimationRate(), preventing the palette from covering the play/pause button (the CI failure on smaller viewports)
• Increase retry timeout to 15s on animation-dependent assertions where the slider needs to reach target values during a ~10s animation cycle

Test plan

• npx cypress run --spec cypress/e2e/slider.spec.ts passes locally

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.78%. Comparing base (a40dd61) to head (7734c0b).
⚠️ Report is 2 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (a40dd61) and HEAD (7734c0b). Click for more details.

HEAD has 14 uploads less than BASE

Flag	BASE (a40dd61)	HEAD (7734c0b)
cypress	15	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2441       +/-   ##
===========================================
- Coverage   85.32%   69.78%   -15.55%     
===========================================
  Files         763      763               
  Lines       42310    42310               
  Branches    10071    10071               
===========================================
- Hits        36102    29525     -6577     
- Misses       6196    12779     +6583     
+ Partials       12        6        -6     

Flag	Coverage Δ
cypress	39.30% <ø> (-29.63%)	⬇️
jest	58.06% <ø> (ø)

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[cypress]

codap-v3    Run #10489

Run Properties:   Passed #10489  •  e85b21e2d7: Increment the build number

Project	codap-v3
Branch Review	main
Run status	Passed #10489
Run duration	02m 11s
Commit	e85b21e2d7: Increment the build number
Committer	github-actions[bot]
View all properties for this run ↗︎

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Test results
Failures	0
Flaky	0
Pending	0
Skipped	0
Passing	4
View all changes introduced in this branch ↗︎

[Copilot]

Pull request overview

This PR addresses flakiness in the Slider Cypress E2E test by ensuring the slider’s inspector palette doesn’t obstruct the play/pause controls and by extending the retry window for assertions that depend on animation timing.

Changes:

• Close the slider inspector palette after setting the animation rate to avoid UI overlap with the play/pause button.
• Add an optional timeout parameter to the slider variable value input lookup helper.
• Update animation-dependent assertions in slider.spec.ts to wait up to 15s for the slider value to reach expected targets.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
v3/cypress/support/elements/slider-tile.ts	Adds optional timeout to getVariableValueInput() and closes the inspector palette after setting animation rate.
v3/cypress/e2e/slider.spec.ts	Uses getVariableValueInput(..., 15000) with contain.value assertions for animation-dependent waits.

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[kswenson]

Merging without human review, as it's just a test change.