fix: improve empty space utilization below upload box

[riyakandwal]

Description

This PR addresses issue #774 by improving the empty space utilization below the upload box.

Changes made:

• Added a "Getting Started" section below the upload area
• Added visual onboarding steps for first-time users
• Improved content distribution in the empty state layout
• Enhanced overall user experience and visual balance

Related Issue

Closes #774

Type of Contribution

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

Participant Info

• GitHub username: riyakandwal
• Contribution level: Beginner

Screen Recording

N/A

Checklist

• I have read the contribution guidelines
• My changes follow the project structure

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[github-actions]

✅ PR Format Check Passed — @riyakandwal

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

[github-actions]

👋 Thanks for your PR, @riyakandwal!

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)

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• 📖 CONTRIBUTING.md
• 🐛 Open Issues
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Happy coding! 🎉