DRY: Palette color onChange handler duplicated inline for color picker and hex input

[cjv]

Problem

In src/components/Sidebar.tsx, the palette edit section maps over state.palette and renders two inputs per slot. Both the <input type="color"> and <input type="text"> share the same two-line handler written out twice inline:

onChange={(e) => { state.setPaletteColor(i, e.target.value); setSelectedPreset('custom'); }}

Affected lines: ~158–169.

Proposed fix

Extract the handler above the return:

const handlePaletteChange = (i: number, color: string) => {
  state.setPaletteColor(i, color);
  setSelectedPreset('custom');
};

Reference it from both inputs.