feat(docs): work on theme picker

[pdanpdan]

• fix and optimize inputValue processing in ColorPalette

  • svelte reactivity is not very funny
  • the effects are called right when the value changes (not batched), and we have to be very carefull with the order different state values are changed

• use a single handleKeydown listener in ColorPalette

• use colorName as key to mark colors as selected

  • color has duplicates zinc-50 and neutral-50

• make sure we pick neutral-50 instead of zinc-50

  • in tailwind palette neutral-50 and zinc-50 are identical
  • pick neutral-50 because it is more meaningfull

• avoid bind:value in ThemeCSSModal because we already have a listener on it

[saadeghi]

Thanks for the PR @pdanpdan

The value of neutral-50 and zinc-50 is indeed the same.
But isn't it a weird UX that people cannot choose zinc-50.
It feels like that color is broken if we click it and another cell gets selected.
I think either both should be shown as selected (existing behavior at https://daisyui.com/theme-generator) or the chosen one must be selected.