fix(chat): tall deleted message falls back to default delete animation

The dust-effect height gate skipped the dust visual for a message taller than
1800pt, but the correlation ids were already marked applied before the gate, so
getCustomItemDeleteAnimationDuration still returned the custom 0.8s duration —
giving a tall message a slow, dust-less collapse that never hid the item. Drop
the tentatively-applied ids when the batch is dust-ineligible so those messages
use the default list delete animation; the ids stay consumed so they are not
re-processed.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>