fix: accessibility improvements for Stellar flows

[lightnoor890]

closes #75

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[truthixify]

A11y fixes look good (StellarReceive aria-live region, focus rings, contrast). Conflicts now on multiple files because recent demo PRs touched them. Quick rebase:

git fetch origin
git rebase origin/develop
# For each conflicted component file, keep develop's structure + re-apply your aria/role/focus additions
git add -u
git rebase --continue
git push --force-with-lease

Also note: PR body has no closes #N reference. If this is for a specific assigned issue, add the link.