stop

Stops or pauses the active operation of this control.

This typically involves pausing content playback, animations, or data fetching, and potentially reducing resource consumption. The control should retain its state so it can be resumed by #start().

Calling stop()} on an already stopped control should be a no-op.

Stops the periodic updates for the clock. Any pending updates (callbacks for the `runnable`) are removed from the handler's message queue. This effectively pauses the clock's visual updates.

Calling start again will resume the updates.