feat(agenda): suspend auto-dim while the agenda frame is openHEADmain

The refresh tick's selection swing marks the working window non-selected, and auto-dim's debounced dim lands after the tick, so the working frame visibly dimmed every five minutes. Spawn now turns auto-dim-other-buffers-mode off (remembering it was on) and closing the frame restores it. A spawn with auto-dim already off touches nothing. It also keeps the standing agenda fully lit instead of dimmed-when-unfocused.

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