ux: Makes text area buttons appear only when there's text

[brunobergher]

As it says on the tin, makes the default state cleaner.
No functional changes.

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Important

Buttons in ChatTextArea now only appear when there is text input, using a memoized check to conditionally apply styles.

• Behavior:
  • Buttons in ChatTextArea only appear when there is text input, using hasInputContent to check input content.
  • Buttons have opacity-0 and pointer-events-none when no text, and opacity-50 or opacity-100 with pointer-events-auto when text is present.
• Code Changes:
  • Added hasInputContent memoized check in ChatTextArea.tsx to determine if input has content.
  • Updated button styles in ChatTextArea.tsx to conditionally apply styles based on hasInputContent.

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[roomote]

Thank you for your contribution! I've reviewed the changes and the implementation successfully achieves the goal of making the UI cleaner by hiding buttons when there's no text. I have some suggestions for improvement below.

[mrubens]

I like this! Let me know when it's ready to merge.