The exact-FCI row is now a two-column flex layout: the editable raw FCI
textarea on the left, the decoded FCP list on the right (50/50, textarea
4 rows). Preview rendering split into profilerFciPreviewItems; a new
profilerFciInput hook updates the rule and re-decodes the panel on every
keystroke (no editor re-render, no focus loss), showing an empty body
while the hex is incomplete/invalid. Docs wording updated. SW cache
v72 -> v73.