feat(combobox): add chips

[maxffarrell]

Summary

I referenced the base ui implementation for this since according to shadcn docs, base ui component is used even when project is set to radix

• Adds Combobox.Chips, Combobox.Chip, and Combobox.ChipRemoveButton components for rendering selected values as removable chips in a type="multiple" combobox
• Adds clearInputOnSelect and removeOnBackspace props to Combobox.Input for chip-friendly UX (clear input after selection, backspace to remove last chip)
• Makes inputValue bindable in combobox.svelte so internal updates propagate out via bind:inputValue
• Adds full docs with a live demo and API reference entries for all new components and props
• All existing combobox tests pass with no breaking changes

New API

<Combobox.Root type="multiple" bind:value bind:inputValue {items}>
  <Combobox.Chips>
    {#each value as chipValue (chipValue)}
      <Combobox.Chip value={chipValue}>
        {#snippet children({ label })}
          <span>{label}</span>
          <Combobox.ChipRemoveButton>✕</Combobox.ChipRemoveButton>
        {/snippet}
      </Combobox.Chip>
    {/each}
    <Combobox.Input clearInputOnSelect removeOnBackspace />
  </Combobox.Chips>
  <Combobox.Portal>
    <Combobox.Content>
      {#each filteredItems as item}
        <Combobox.Item value={item.value} label={item.label} />
      {/each}
    </Combobox.Content>
  </Combobox.Portal>
</Combobox.Root>

🤖 Generated with Claude Code

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