🍎 fix: Update "Enter to send" behavior for Mac users

[danny-avila]

Closes #4516

Summary

I implemented changes to improve the "Enter to send" functionality, ensuring consistent behavior across different operating systems, particularly for Mac users. These updates affect both the user interface language files and the underlying logic in the useTextarea hook.

• Updated language files (Br.ts, Eng.ts, Jp.ts, Zh.ts) to include "⌘ + Enter" alongside "Ctrl + Enter" in the user interface text, providing clear instructions for Mac users.
• Modified the useTextarea hook to recognize both Ctrl and Command (Meta) key combinations with Enter for sending messages when the "Enter to send" feature is disabled.
• Ensured consistency across different language versions of the application, improving the user experience for non-English speakers.
• Addressed a potential usability issue where Mac users might have been unaware of the correct key combination to send messages when "Enter to send" was disabled.

Change Type

• Bug fix (non-breaking change which fixes an issue)

Testing

To test these changes:

1. Run the application on both Windows/Linux and Mac systems.
2. Navigate to the chat interface and toggle the "Enter to send" setting off.
3. Attempt to send messages using Enter, Ctrl+Enter, and Cmd+Enter (on Mac).
4. Verify that the behavior matches the updated language descriptions.
5. Check all supported languages to ensure the updated text is displayed correctly.

Checklist

• My code adheres to this project's style guidelines
• I have performed a self-review of my own code
• I have commented in any complex areas of my code
• I have made pertinent documentation changes
• My changes do not introduce new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules