Svelte transitions re-trigger on every swap (or don’t run) with manualSwap

When using Swapy with Svelte and `manualSwap: true`, sorting works fine, but Svelte transitions behave incorrectly: - On every swap (reorder only), `in:` / `out:` transitions sometimes re-trigger as if the item was removed and re-added. - Other times, transitions don’t run at all after a swap. - I only expect transitions on add/remove; reorders should use `animate:flip` and not fire `in:`/`out:`.