feat: add visual aspect ratio thumbnails to presets

[jaygaikar-09]

Description

Added visual aspect-ratio thumbnails to the preset selector to improve discoverability and quick scanning of export formats.

Implemented lightweight SVG-based previews that accurately represent each preset ratio (9:16, 16:9, 1:1, 21:9, etc.) while preserving the original compact preset grid layout.

The thumbnails scale proportionally within a consistent 24×24px bounding box and integrate with the existing Reframe design system without introducing new dependencies.

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Related Issue

Closes #672

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Type of Contribution

• Bug fix
• New feature
• Documentation update
• GSSoC contribution

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Participant Info

• GitHub username: jaygaikar-09
• Contribution level (Beginner/Intermediate/Advanced): Advanced

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Screen Recording

(https://drive.google.com/file/d/1VdfixuydPqy1JWnHqW2ltPZVgh2ohYCg/view?usp=sharing)

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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)

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Summary of Changes

Added

• src/components/ui/AspectRatioThumbnail.tsx
  • Lightweight SVG-based aspect-ratio preview component
  • Accurate proportional scaling using actual preset dimensions
  • Centered rendering within fixed 24×24px bounds

Updated

• src/components/PresetSelector.tsx
  • Integrated visual ratio thumbnails into preset cards
  • Improved thumbnail alignment and spacing consistency
  • Preserved original responsive preset grid layout

Rendering Improvements

• Uses contain-fit scaling:
  • scale = min(24 / width, 24 / height)
• Correctly distinguishes:
  • 9:16 (vertical)
  • 16:9 / 21:9 (horizontal)
  • 1:1 (square)
  • portrait/cinematic formats
• Rounded SVG rectangles with subtle stroke/fill styling
• Active preset state aligned with existing film accent theme

Accessibility

• Decorative thumbnails use aria-hidden="true"
• Existing preset button labels and accessibility semantics preserved
• No impact on keyboard navigation or responsive behavior

UX Improvements

• Faster visual scanning of export presets
• Better distinction between portrait, square, and cinematic formats
• Preserves original compact UI without redesigning the selector
• No additional package dependencies added

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✅ PR Format Check Passed — @jaygaikar-09

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[github-actions]

👋 Thanks for your PR, @jaygaikar-09!

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

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

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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
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Happy coding! 🎉