The popover was hard-anchored bottom-[60px] — always growing upward
from the textarea. ScriptPanel's only mount (CloneDesignTab) puts that
input at the very top of the panel, so the tag list (max-h 280px,
including the CMU phoneme chips visible in the owner's screenshot)
extended past the viewport top, unreachable and unscrollable. Anchored
top-[calc(100%+6px)] instead: below the input, where the panel's
topmost placement guarantees room in its one mount.
Regression test locks the placement (top-anchored, bottom-[60px]
banned).
Co-authored-by: mergetest <test@local>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>