fix(ui5-segmented-button): correct ARIA attributes for accessibility compliance

[Copilot]

• Fix SegmentedButton ARIA attributes for accessibility compliance
  • Add conditional aria-multiselectable based on selection mode
  • Add aria-orientation="horizontal" attribute
• Add focused Cypress test for aria-multiselectable validation
  • Tests both Single mode (aria-multiselectable="false") and Multiple mode (aria-multiselectable="true")
  • Validates aria-orientation="horizontal" is present in both modes

Fixes: #12263

[cla-assistant]

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1 out of 2 committers have signed the CLA.

✅ ilhan007
❌ Copilot
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[cla-assistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[ilhan007]

Hi @copilot

Remove the html code and the test, just add one more test in the SegmentedButton.cy.tsx similar to the

it("segmented button item should have correct aria descriptions", () => {
...

maybe

it("segmented button item should have correct aria-multiselectable", () => {
...

[ilhan007]

Hi @copilot

Remove the html code and the test, just add one more test in the SegmentedButton.cy.tsx similar to the

it("segmented button item should have correct aria descriptions", () => {
...

maybe

it("segmented button item should have correct aria-multiselectable", () => {
...

[Copilot]

Hi @copilot

...

Completed! Removed the HTML test code and unit test file, and added the requested Cypress test "segmented button should have correct aria-multiselectable" following the same pattern as the existing aria descriptions test. The test validates both selection modes and the horizontal orientation. See commit d610581.

[Copilot]

Hi @copilot

Remove the html code and the test, just add one more test in the SegmentedButton.cy.tsx similar to the
...

Done! I've removed the HTML test code and unit test, and added a focused Cypress test "segmented button should have correct aria-multiselectable" in SegmentedButton.cy.tsx that validates both Single mode (aria-multiselectable="false") and Multiple mode (aria-multiselectable="true"), plus aria-orientation="horizontal" for both modes. Changes committed in d610581.