refactor: modernizes visibility tests

[cacieprins]

• Closes

Additional details

In preparation for testing visibility algorithm modifications, this refactors the visibility.cy.ts spec. It now uses static html fixtures, and a declarative testing style that makes it easier to determine what should and should not be visible.

Steps to test

How has the user experience changed?

PR Tasks

• Have tests been added/updated?
• [NA] Has a PR for user-facing changes been opened in cypress-documentation?
• [NA] Have API changes been updated in the type definitions?

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Note

Rewrites DOM visibility tests to use static HTML fixtures with declarative expectations and shared helpers, expanding coverage across CSS, forms, overflow, positioning, transforms, and reason messages.

• Test Refactor (Cypress e2e):
  • Visibility spec overhaul in packages/driver/cypress/e2e/dom/visibility.cy.ts:
    • Introduces helpers assertVisibilityForEl, prepareFixtureSection, assertVisibilityForSections and groups tests into scenario suites.
    • Switches from ad-hoc DOM construction to visiting fixtures and asserting via cy-expect/cy-legacy-expect.
    • Adds focused checks for html/body overrides and updates #getReasonIsHidden assertions to read from fixtures.
  • New fixture set under packages/driver/cypress/fixtures/visibility/:
    • basic-css-properties.html, form-elements.html, overflow.html, positioning.html, transforms.html, empty.html, table-visibility.html.
    • Shared assets: style.css (section visibility and highlighting) and ux.js (in-page nav/section activation).
  • Coverage expansion:
    • Validates visibility across CSS properties (display, visibility, opacity), form/select/optgroup cases, overflow clipping/scroll, absolute/fixed/sticky positioning, transforms (scale/rotate/skew/matrix/perspective/backface), and detailed "reason hidden" messages.

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[cypress]

cypress    Run #66995

Run Properties:   Passed #66995  •  92f7b8eff0: Merge branch 'develop' into refactor/visibility-tests

Project	cypress
Branch Review	refactor/visibility-tests
Run status	Passed #66995
Run duration	16m 10s
Commit	92f7b8eff0: Merge branch 'develop' into refactor/visibility-tests
Committer	Cacie Prins
View all properties for this run ↗︎

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Test results
Failures	0
Flaky	0
Pending	11
Skipped	0
Passing	636
View all changes introduced in this branch ↗︎

UI Coverage  0%
Untested elements	4
Tested elements	0

Accessibility  100%
Failed rules	0 critical   0 serious   0 moderate   0 minor
Failed elements	0