Change `tags` layout to be an autocomplete kind of deal.

import {set, unset} from 'sanity'
import {Autocomplete, Card} from '@sanity/ui'
import {useCallback, useState, useEffect} from 'react'
import {useClient} from 'sanity'

function TagsAutocompleteInput(props) {
  const {onChange, value = [], schemaType} = props
  const [inputValue, setInputValue] = useState('')
  const [existingTags, setExistingTags] = useState([])
  
  const client = useClient({apiVersion: '2024-01-01'})
  
  // Fetch existing tags from your content
  useEffect(() => {
    client.fetch(`array::unique(*[defined(tags)].tags[])`)
      .then(setExistingTags)
  }, [client])
  
  // Filter tags based on input
  const suggestions = existingTags.filter(tag => 
    tag.toLowerCase().startsWith(inputValue.toLowerCase())
  )

  const handleSelect = useCallback((selectedTag) => {
    // Add the selected tag to the array
    const newValue = [...(value || []), selectedTag]
    onChange(set(newValue))
    setInputValue('') // Clear input for next tag
  }, [value, onChange])

  const handleRemoveTag = useCallback((index) => {
    const newValue = value.filter((_, i) => i !== index)
    onChange(newValue.length ? set(newValue) : unset())
  }, [value, onChange])

  return (
    <Card>
      {/* Display existing tags with remove buttons */}
      <div>
        {value?.map((tag, index) => (
          <span key={index}>
            {tag}
            <button onClick={() => handleRemoveTag(index)}>×</button>
          </span>
        ))}
      </div>
      
      {/* Autocomplete input */}
      <Autocomplete
        options={suggestions.map(tag => ({value: tag}))}
        value={inputValue}
        onChange={setInputValue}
        onSelect={handleSelect}
        placeholder="Type to search tags..."
      />
    </Card>
  )
}

{
  name: 'tags',
  title: 'Tags',
  type: 'array',
  of: [{type: 'string'}],
  components: {
    input: TagsAutocompleteInput
  },
  validation: Rule => Rule.required().min(2).error('At least 2 tags are required.')
}