[FEATURE] Add keyboard shortcut for "Send" in compact/split view layouts (e.g. Ctrl+Enter or configurable option)

[JohannesPartsch]

Context:
When using ChatGPT in a split-screen setup (e.g. VS Code left, ChatGPT right), the chat window enters a compact layout. In this layout, hitting Enter only adds a line break – which is great for formatting – but there's no obvious way to send a message using the keyboard.

Currently, the only way to send a message is to tab to the “Send” button and hit Enter, which slows down the workflow, especially for keyboard-heavy users.

Proposal:

Add a keyboard shortcut like Ctrl + Enter, Ctrl + ., or even better: make the send shortcut configurable.

Allow users to toggle whether Enter sends or adds line breaks, possibly via a toggle in settings or even dynamically (like Discord’s "Shift+Enter for newline").

Why it matters:
For developers and productivity users working in a split layout (ChatGPT + IDE), this improves accessibility and usability.

Environment:

Desktop browser (tested in Opera, Windows 11)

1/3-width window layout (non-touch keyboard)

[github-actions]

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