Adapt speech recognition to begin as 'false' and dynamically update state.
UX: the button can now be dynamic (no hydration issues). Differentiated
mobile vs desktop look.
I need to use the 'useCallback' function to pass the onResult callback,
otherwise the code loops (as the callback function will get recreated
every time, and it's circular).
The keys are stored within the localStorage of the browser.
The string is passed to the backend as a parameter in the REST
API call (to '/api/chat'), where it has priority over other
keys set in the OPENAI_API_KEY of the backend.
Enrico Ros