Replace the boolean "skip first render" ref with a ref that stores the
previously-seen tick value. The effect now compares against the stored
value and only fires when it differs, which makes the dependency
naturally used (removes the `void slideoutOpenedTick;` acknowledgement)
and self-documents the intent of the guard.
Behavior is unchanged — both forms preserve the one-shot-per-event
semantics of the prior window-event implementation. The JSDoc on
`slideoutOpenedTickAtom` is updated to describe the new pattern.
suryo12
d571cb23fa