Implement SimpleAutocomplete and use it in ModelIdInput

[dlqqq]

Description

• Implements a new SimpleAutocomplete component that avoids the bugs with MUI's Autocomplete component, documented in [litellm] Display model IDs to match search string  jupyterlab/jupyter-ai#1445.

• By default, options are filtered using case-insensitive substring matching.

• The boldMatches prop bolds matched substrings in each option when set.

• This component is similar in UX to what existed previously, but it provides a vastly simpler API:

<SimpleAutocomplete
  options={modelsAsOptions}
  value={input}
  onChange={v => setInput(v)}
  placeholder={props.placeholder}
  boldMatches
/>

Demo

Screen.Recording.2025-08-15.at.3.03.02.PM.mov