feat(accessibility): enable keyboard navigation for toolbar controls

[DhyaniKavya]

issue : #5809
Problem:
Toolbar icons function as buttons but are not keyboard focusable,
preventing keyboard navigation and violating accessibility guidelines.

Solution:
Adds role="button" and tabindex="0" to toolbar anchor elements
to enable keyboard focus and interaction.

Changes:

• Updated index.html toolbar elements
• No structural or styling changes
• Minimal diff

Testing:

• npm test passed
• Verified keyboard tab navigation
• HTML structure remains valid

This PR focuses only on toolbar accessibility improvements.

[github-actions]

✅ All Jest tests passed! This PR is ready to merge.

[github-actions]

✅ All Jest tests passed! This PR is ready to merge.

[DhyaniKavya]

@vanshika2720
Thanks for the suggestion. I’ve split the accessibility changes into a focused PR that only adds keyboard accessibility attributes to toolbar elements and keeps the diff minimal.

Could you please confirm if this scope looks correct for the issue

[DhyaniKavya]

@Commanderk3 Can you review this PR and tell me if this needs further changes or it is good to go.

[Commanderk3]

@DhyaniKavya could you post a video here? On my testing I did not find any highlights on buttons when pressed TAB.

[github-actions]

✅ All Jest tests passed! This PR is ready to merge.

[DhyaniKavya]

Keyboard.Accessibility.mp4

@Commanderk3 Thanks for checking this earlier. I believe the focusability was present, but the focus indicator was not clearly visible against the toolbar background, which made it appear as if focus was missing.
I’ve improved the visibility of the focus state so it is easier to notice during keyboard navigation.
I’ve attached a short screen recording demonstrating Tab navigation and activation using the keyboard. Please let me know if you’d like any further adjustments.

[Commanderk3]

Yup, It is working fine now. Nice work.

[DhyaniKavya]

Thankyou for Reviewing this and guiding me properly . It feels good to work with such guidance. 🙌

[DhyaniKavya]

@walterbender @omsuneri please review the changes. If anything needs to change , i am open to address it. Thankyou