Filter pill: open state and deferred move-left

/conversations on local stage (anonymized data), 2026-10-02, with PR #15704 (open state) and PR #15706 (deferred reorder) combined.

Before: Topic is the third pill, nothing open.

0-initial light — Light

0-initial dark — Dark

Topic opened and "Leasing" ticked. The open pill has the indigo border and halo, and it stays third, under the cursor (#15704 + #15706).

1-open-ticked light — Light

1-open-ticked dark — Dark

After Escape: the panel closed and only then the pill moved to the front.

2-closed light — Light

2-closed dark — Dark