Switch: never set checked itself, report the new state instead

The shared Switch flipped its own checked on click, which replaced the
caller's binding with a constant. Every use binds checked, so after a
click the switch stopped following its source: Discard on a settings
draft reverted the value and left the switch showing the click. Four
status rows and the headphones panel each carried a resync workaround
for it.

toggled now carries the new state and the switch moves only when the
caller's binding does. Handlers that read checked as the new value take
the argument instead; the workarounds are gone.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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