Rework Equalizer Modal design

[bubu07codes]

Feature Request

The current 10-band Equalizer modal is functional, but we want to upgrade its visual style.

This is a great task for anyone who enjoys tweaking UI, CSS, and layout components in React.

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🛠️ Step-by-Step Implementation Guide

1. Fork and clone the repo, then run npm install.
2. Open src/renderer/src/components/Equalizer/EqualizerModal.tsx.
3. Update the JSX structure and style classes (styles live in src/renderer/src/constants/globalCss.ts or inline Tailwind classes).
4. Test locally:
   • Run npm run dev.
   • Press E or click the Equalizer button to open the modal.
   • Verify all 10 bands adjust properly, presets apply smoothly, and the layout stays responsive on all sizes.

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🧪 Verification

Make sure typechecks pass before opening a PR:

npm run typecheck

Thanks!