[FEATURE]:Add Send to Shortcuts

[mlevison]

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

As a Mac user, CMD+Send is my preferred way to send the message to the model. Plain Send is for carriage returns.

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• [FEATURE]: Setting to send prompt only with send button, not hitting enter. #16226: Feature request for configurable send-prompt keybindings (same core need — controlling how/when the message is submitted)
• [FEATURE]: Allow to Shift + enter to edit in next line without enter #9836: Feature request for Shift+Enter to insert newlines vs. sending (same underlying tension between Enter-to-send and Enter-for-newline)

For keybind-related issues, please also check our pinned keybinds documentation: #4997

[mlevison]

The UI implies that this isn't possible currently, so this isn't a duplicate.