feat: add terminal theme editor with live preview

[jainiksha]

Summary

• Added ThemeEditor component for managing terminal themes
• Added live theme preview functionality
• Added color customization support
• Added theme import and export features
• Added reusable ThemeConfig interface

Closes #1593

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 6407edaa-abc7-4920-84b0-916dc94214c3

📥 Commits

Reviewing files that changed from the base of the PR and between cb3669a and 084b906.

📒 Files selected for processing (2)

• packages/ui/src/ThemeEditor.ts
• packages/ui/src/index.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[jainiksha]

@Karanjot786 resolved merge conflict