Add dropzone accessibility

[RakibRahman]

feat: add keyboard navigation support to DropZone

• Made DropZone focusable with tabIndex={0}.
• Added onKeyDown handler for Enter/Space key support.
• Improved accessibility with role="button" and aria-label.
• Enhanced focus styles for better usability.

Preview:

[netlify]

✅ Deploy Preview for squish-image ready!

Name	Link
🔨 Latest commit	896455e
🔍 Latest deploy log	https://app.netlify.com/sites/squish-image/deploys/67c8b07be5c9b30008086629
😎 Deploy Preview	https://deploy-preview-10--squish-image.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[coliff]

Just tested this - it's a helpful addition. 👍 You can use it with just a keyboard now!

[coliff]

Would be great to fix this accessibility issue too:

[RakibRahman]

fixed accessibility issues for the image quality input.

[mathcrln]

Hey @coliff, I have been checking out this pull request along with a couple of other recent ones and I'm loving all of the changes introduced by all these contributors! I see you already approved this PR, what would it take to merge it into production?

I'm already excited to use the changes introduced in #13 and #15 :)

[coliff]

I'm not an admin of this repo... I think only @addyosmani is able to merge. Hopefully he'll get round to it soon!