Fix voice message not sending when cursor doesn't move

[jasPreMar]

Summary

• When the user held the invoke hotkey without moving the cursor, recorded a voice message, and released, the message was silently cancelled and never sent
• Root cause: isCommandKeyVisible only becomes true on cursor movement, and the guard in endCursorFollowInvokeHoldMode cancelled voice + dismissed the panel when it was false
• Fix: active voice state (.listening or .transcribing) now also satisfies the guard, so voice-only interactions work without requiring cursor movement

Test plan

• Hold invoke hotkey without moving cursor, record voice message, release — message should send
• Hold invoke hotkey, move cursor, record voice message, release — still works as before
• Hold invoke hotkey without moving, release without recording — should still dismiss silently
• Run swift run ThisTests — 102 tests pass

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