feat: add reduce noise toggle using hqdn3d filter

[imuniqueshiv]

Description

Closes #678

Added a new "Reduce noise" toggle to the export settings panel to expose FFmpeg's hqdn3d denoise filter for low-light and noisy footage.

What Changed

• Added denoise: boolean to EditRecipe

• Added denoise: false to DEFAULT_RECIPE

• Integrated hqdn3d=1.5:1.5:6:6 into the FFmpeg video filter chain

• Added a new "Reduce noise" checkbox toggle in ExportSettings

• Added tooltip/help text:

  "Reduces video noise. May slow down export slightly."

• Ensured exports work correctly with the toggle enabled and disabled

Testing

Tested locally with:

• Toggle OFF → normal export works
• Toggle ON → hqdn3d filter added successfully to FFmpeg filter chain
• Export completes successfully in both cases
• bunx tsc --noEmit passes with no TypeScript errors
• bun run lint passes with no ESLint errors related to this change

Related Issue

Closes #678

Type of Contribution

• New feature
• GSSoC contribution

Participant Info

• GitHub username: imuniqueshiv
• Contribution level: Intermediate

Screen Recording

noise_reframe.1.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

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[github-actions]

👋 Thanks for your PR, @imuniqueshiv!

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

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• Linked the issue this PR closes (e.g. Closes #123)
• Tested the changes locally (bun run dev)
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