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Rule 27: a history nobody can read is not shipped. `RuleHistoryPanel.vue` sits below the fields in `RuleEditorSlideOver`, where a rule is read in full — not on the list row, where a history entry point would compete with the row's job. REUSE, DECIDED FIELD BY FIELD RATHER THAN ALL AT ONCE. DiffView.vue is reused unchanged: it takes DiffLine[] and nothing note-shaped. HistoryPanel.vue is NOT, and its props are the reason — noteId + currentBody, a NoteVersion carrying tags and pin columns, a fetch of /api/notes/…, a restore emit, pin/unpin buttons. Rules have no tags, no pins, and deliberately no restore, and a rule's text is EIGHT fields rather than one body, which changes the reader's question from "what changed" to "which fields moved". Recorded here rather than forked silently, per #3207. THE FORK THAT WAS ALREADY THERE. The LCS walk existed three times — privately in useAssist.ts, and again inside HistoryPanel.vue and VersionHistorySection.vue — character-identical apart from quote style, because computeDiff was never exported. Rather than add a fourth copy, it moves to utils/diff.ts and the three become imports; the extraction was verified equivalent to all three before anything was deleted. DiffLine is re-exported from useAssist so its existing importers are untouched. WHAT A ROW SHOWS: when, and which fields moved. A version holds the text the edit REPLACED, so the edit is the step from a row to the next NEWER state — the row above it, or, for the newest row, the rule as it stands now. Comparing against the row below would attribute every change to the wrong edit. A field nobody has fetched yet reads as neither changed nor unchanged. An edit that touched verify_with is badged "check reset", because that edit silently cleared verified_at (milestone 312) and put the rule back at the top of the staleness sweep — a moment visible nowhere else. The badge is a 12% color-mix TINT, not solid `--fs-warning`. `--fs-warning-fg` is defined in theme.css as "warning TEXT on a warning tint", so painting it over the solid token is exactly the same-hue contrast failure #3141 records. Every var() the component references resolves against theme.css, checked before pushing. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>