feat: Improve keyboard focus visibility for accessibility

[abdulazees1111s]

Summary

Improved keyboard focus visibility across UI components to enhance accessibility.

Changes Made

• Added global focus-visible styles
• Improved focus styles for toolbar buttons
• Enhanced dropdown focus visibility
• Improved palette item focus contrast

Accessibility

Improves usability for keyboard users and users with accessibility needs.

Testing

• Verified focus visibility using keyboard navigation (Tab key)
• Tested toolbar, dropdown, and palette navigation

PR Category

• Accessibility
• Feature

• Bug Fix

[abdulazees1111s]

Hi! I created a PR to improve keyboard focus visibility for accessibility. Could someone review it? Thanks!

[github-actions]

❌ Some Jest tests failed. Please check the logs and fix the issues before merging.

Failed Tests:

toolbar.test.js

[kartikktripathi]

This seems to have a lot of unrelated changes. Please check and remove them before a maintainer takes a look.

[vanshika2720]

@abdulazees1111s Please split this PR into smaller ones:

PR 1: Accessibility (focus styles only)
PR 2: Tamil + language additions
PR 3: Translation updates (ta.json)
PR 4 (optional): Toolbar cleanup

[Ashutoshx7]

any updates on this ?

[github-actions]

This PR has merge conflicts with master.

Please rebase your branch:

# Add upstream remote (one-time setup)
git remote add upstream https://github.com/sugarlabs/musicblocks.git

# Fetch latest master and rebase
git fetch upstream
git rebase upstream/master

# Resolve any conflicts, then:
git push --force-with-lease origin YOUR_BRANCH

Tip: Enable "Allow edits from maintainers" on this PR so we can auto-rebase for you next time. This only grants access to your PR branch. Your fork's other branches are not affected.

[github-actions]

Merge conflicts resolved. Ready for review.

[github-actions]

❌ Some Jest tests failed. Please check the logs and fix the issues before merging.

Failed Tests:

toolbar.test.js

[Ashutoshx7]

toolbar jest still faling take a look

[github-actions]

This PR has merge conflicts with master.

Please rebase your branch:

# Add upstream remote (one-time setup)
git remote add upstream https://github.com/sugarlabs/musicblocks.git

# Fetch latest master and rebase
git fetch upstream
git rebase upstream/master

# Resolve any conflicts, then:
git push --force-with-lease origin YOUR_BRANCH

Tip: Enable "Allow edits from maintainers" on this PR so we can auto-rebase for you next time. This only grants access to your PR branch. Your fork's other branches are not affected.

[zealot-zew]

lot of unrelated changes. and i believe we have keyboard focus visibility on master.
@walterbender This PR can be closed now

[walterbender]

Please reopen as smaller, targeted PRs