feat: add spectrum extension wet only monitor

[JadenJSJ]

Summary by CodeRabbit

• New Features

  • Added spectrum boost toggle to expand strength range above standard limits (experimental).
  • Added wet-only monitor option to output only Spectrum Extension content without the original signal.

• UI/UX Improvements

  • Simplified downloads table by removing redundant columns for cleaner presentation.

[coderabbitai]

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/spectrum-ext-add-wet-only

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