feat: add social media quick-action row presets for Reels, TikTok, and Shorts

[Vagventure]

Description

Adds a row of five one-click platform buttons above the preset search input in PresetSelector.tsx. Users can now select the most common social media formats instantly without scrolling through the dropdown.

Platforms added:

• Instagram Reels → vertical-9-16 (1080×1920)
• TikTok → vertical-9-16 (1080×1920)
• YouTube Short → vertical-9-16 (1080×1920)
• YouTube → landscape-16-9 (1920×1080)
• Twitter/X → twitter-hd (1280×720)

Each button shows an SVG platform icon and label. The active button highlights when its preset is selected. Icons are drawn from scratch with no external dependencies.

Related Issue

Closes #661

Type of Contribution

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

Participant Info

• GitHub username: Vagventure
• Contribution level (Beginner/Intermediate/Advanced): Beginner

Screen Recording

Screen.Recording.2026-05-19.062436.mp4

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]

@Vagventure 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]

✅ PR Format Check Passed — @Vagventure

Basic format checks passed. A maintainer will review your code changes.

This does not mean the PR is approved — it just means the format is correct.

[github-actions]

👋 Thanks for your PR, @Vagventure!

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! 🎉