fix : fixed the inverted slider

[pratyuxxhh]

Description

Fixed the inverted export quality slider logic in the export settings UI.

Changes made:

• Corrected the slider behavior so that moving the slider toward the right now properly represents High quality output.
• Moving the slider toward the left now correctly represents Small file / lower quality output.
• Fixed incorrect label mapping between slider position, CRF values, and estimated file size.

Correct behavior after fix:

• Right side → High quality, lower CRF, larger file size
• Left side → Smaller file, higher CRF, smaller file size

Also added before/after screenshots to demonstrate the fix.

Related Issue

Closes #741

Type of Contribution

• Bug fix
• GSSoC contribution

Participant Info

• GitHub username: pratyuxxhh
• Contribution level: Intermediate

Screenshots 

Before

After

Checklist

• I have read the contribution guidelines
• My changes follow the project structure
• I have tested my changes in Chrome, Firefox, and Safari
• bun run lint passes (no ESLint errors)
• bunx tsc --noEmit passes (no TypeScript errors)
• New interactive elements have aria-label / accessible names
• No console.log statements left in
• This PR is related to a valid issue
• Screen recording attached above (required for UI/feature/design changes)

[vercel]

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

A member of the Team first needs to authorize it.

[github-actions]

👋 Thanks for your PR, @pratyuxxhh!

Welcome to Reframe — a browser-based video editor built for everyone 🎬

🟠 GSSoC'26 PR detected — thanks for contributing under GirlScript Summer of Code 2026!

What happens next

1. 🤖 Automated checks — build & TypeScript typecheck will run automatically
2. ✅ Vercel preview — a preview deployment will be created (requires maintainer authorization for fork PRs)
3. 👀 Code review — a maintainer will review your changes
4. 🚀 Merge — once approved, your PR will be merged!

Quick checklist

• PR title follows Conventional Commits (e.g. feat: add dark mode)
• Linked the issue this PR closes (e.g. Closes #123)
• Tested the changes locally (bun run dev)
• Build passes (bun run build)

Useful links

• 📖 CONTRIBUTING.md
• 🐛 Open Issues
• ⭐ Star the repo to support the project!

Happy coding! 🎉

[github-actions]

⚠️ PR Format Issues — @pratyuxxhh

Please fix the following before your PR can be reviewed:

• ⚠️ Use a conventional PR title. Examples:
  • feat: add dark mode support
  • fix: resolve aria label missing on slider
  • docs: add deployment guide to README

Push new commits after fixing — this comment will update automatically.

📖 CONTRIBUTING.md