fix: sent chatCompletion message correctly

[lyjeileen]

Change

• sent chatCompletion message correctly
  • toChatRequest was applied twice for multimodalInput — once in baseInput, and once in multimodalInput. I removed toChatRequest from baseInput and kept the conversion only in multimodalInput and textInput.
• update tests and storybook
  • The way we displayed textInput in Storybook was rendering the baseInput component, instead of textInput. I now render textInput directly and reuse the argType descriptions in both textInput and multimodalInput.

Screenshots

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After