fix: add visual disabled state to export button

[aryanm9026]

Description

This PR updates the Export button in VideoEditor.tsx to include clear visual styling and accessibility attributes when disabled, as requested in the issue's Acceptance Criteria.

Resolves #235

Changes Made

• Added opacity-40 to the disabled state Tailwind classes so the button visually greys out when no file is loaded.
• Added the aria-disabled={!file} attribute to improve accessibility.
• Ensured the cursor-not-allowed class works correctly on hover during the disabled state without conflicting with the active state styles.

Screenshots

[vercel]

@aryanm9026 is attempting to deploy a commit to the magic-peach1's projects Team on Vercel.

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[magic-peach]

Hey @aryanm9026! The CI build check hasn't run on this PR yet — this usually happens when the PR was opened before the CI was fully set up, or if the branch hasn't been updated recently.

To trigger the build check, please rebase onto the latest main:

git fetch origin
git rebase origin/main
git push --force-with-lease

This will re-trigger CI. If you hit any merge conflicts in src/app/page.tsx, keep the version from main (no <main> wrapper around <VideoEditor />).

Once CI passes and the Vercel deployment is authorized, we'll review and merge. 🚀

[github-actions]

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[aryanm9026]

Hey @magic-peach , i fixed it, i hope it works now.