feat(BingAI): convert toneStyle to lowercase before setting it in state
feat(BingAI): pass setToneStyle function to Settings component
refactor(BingAI): remove unused import and change setOption to setToneStyle in Settings component
refactor(fetchers.js): add axiosPost function for debounced axios post requests
feat(api): add @dqbd/tiktoken package as a dependency
feat(api): add /api/tokenizer endpoint to tokenize text using @dqbd/tiktoken
feat(client): add toneStyle dropdown to BingAI Settings component
feat(client): add token count to BingAI Settings component
style(ui): add z-index to Dropdown and EndpointOptionsPopover components
Add z-index to Dropdown and EndpointOptionsPopover components to ensure they are displayed above other components.
