Add keyboard shortcut for sending answers
Add the Cmd + Enter (same formatting as start task) shortcut for answering questions so that the user doesn't have to click Next or Send.

Outcome
On the question pages, ⌘/⌃↵ now presses Next, or Send on the last page; the button shows the hint like Go, hidden on phones. Quick gate and tests green; visual check done on desktop and phone. PR #7863 merged (0cf6838166) and the Jaah Deploy succeeded. Memory: none applied.
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