feat(reports): leftover-map unexplained leftover on grouping comparison strip (v2.54.0)

[seonghobae]

Summary

• Caption leftover-map unexplained leftover U on grouping comparison leftover-pair buttons through formatLeftoverMapUnexplained (ADR 0297 / v2.54.0).
• After make seed, closest and farthest leftover pairs sit above the member list with the Gabriel biplot of already-named coordinates, leftover-map axis share when finite, axis ticks that match ξ (x, y) ζ (x, y) on the pair row, pair segments that match d on the pair row, pair segments that match R̂ on the pair row, pair segments that match R̂²/R² on the pair row, pair segments that match U²/R² on the pair row, pair segments that match 2R̂U/R² on the pair row, pair segments that match U on the pair row, pair segments that match R on the pair row, pair segments that match Y on the pair row, pair segments that match E on the pair row, pair segments that match leftover-map rank on the pair row, a plot caption that matches leftover-map complete-case coverage above the pair list, a plot caption that matches leftover-map item complete-case coverage, a plot caption that matches leftover-map incomplete post coverage, a plot caption that matches leftover-map incomplete item coverage, a pair-list note that matches leftover-map post complete-case coverage, a pair-list note that matches leftover-map item complete-case coverage, a pair-list note that matches leftover-map incomplete post coverage, a pair-list note that matches leftover-map incomplete item coverage, a grouping comparison note that matches leftover-map post complete-case coverage, a grouping comparison note that matches leftover-map item complete-case coverage, a grouping comparison note that matches leftover-map incomplete post coverage, a grouping comparison note that matches leftover-map incomplete item coverage, grouping comparison leftover-pair buttons that match leftover-map reconstruction R̂ on the pair row, grouping comparison leftover-pair buttons that match leftover-map explained leftover share e on the pair row, grouping comparison leftover-pair buttons that match leftover-map unexplained leftover share s on the pair row, grouping comparison leftover-pair buttons that match leftover-map cross share x on the pair row, and grouping comparison leftover-pair buttons that match leftover-map unexplained leftover U on the pair row; click a post marker or a pair button opens that post.
• A missing or non-finite U omits that leftover-map comparison unexplained leftover badge and keeps leftover-map cross share x when finite, leftover-map unexplained leftover share s when finite, leftover-map explained leftover share e when finite, leftover-map reconstruction R̂ when finite, leftover-map distance d, the strip leftover-map post coverage note, leftover-map item coverage note, leftover-map incomplete post note, leftover-map incomplete item note, leftover pairs, and any leftover-map captions on the pair list and graphic. Rank-0 origin cells still name U 0.00 when that persisted leftover is finite. A finite negative leftover is shown, never clamped. Do not invent U from R and R̂, leftover-map distance, plotted coordinates, leftover-map reconstruction, leftover residual, leftover-map explained leftover share, leftover-map unexplained leftover share, leftover-map cross share, leftover-map rank, leftover-map post coverage, leftover-map item coverage, leftover-map incomplete post coverage, leftover-map incomplete item coverage, or the count of unused axes.
• UI-only; no SQL; no new columns. Distinct aria-label Leftover map comparison unexplained leftover. Copy is the same U {signed} formatter as the pair-row badge. The strip does not gain the leftover-map graphic. Never invent a leftover score. Never invent a theta. Do not persist leftover-map inner product, cosine, or length.
• Stacked onto leftover-map cross share on grouping comparison leftover-pair buttons (feat/leftover-map-compare-cross-share-v2530 / feat(reports): leftover-map cross share on grouping comparison strip (v2.53.0) #831 @ 2cefc0b). Leave this PR open for independent review. Do not squash-merge onto the unprotected leftover base. Do not self-approve. After independent review, retarget onto leftover-coordinates (feat/leftover-map-coordinates-v2240 / feat(reports): persist leftover-map coordinates (v2.24.0) #782) rather than squash-merging here.

Verification

• pnpm exec vitest run src/leftoverMapUnexplained.test.ts src/leftoverMapCrossShare.test.ts src/leftoverMapUnexplainedShare.test.ts src/leftoverMapExplainedShare.test.ts src/leftoverMapReconstruction.test.ts src/i18n.test.ts src/App.test.tsx: 7 files, 317 passed.
• pnpm exec oxlint on changed frontend files: 0 warnings, 0 errors.
• PostgreSQL period-report compare tests were not executed here (UI-only; no schema change).

Evidence boundary

Authenticated PostgreSQL API and k6 runtime acceptance are not claimed. No real records or credentials. Synthetic fixtures only.

Independent approval is required. No self-approval, admin bypass, or force push.

Jeon, M., Jin, I. H., Schweinberger, M., & Baugh, S. (2021). Mapping unobserved item–respondent interactions: A latent space item response model with interaction map. Psychometrika, 86(2), 378–403.

Gabriel, K. R. (1971). The biplot graphic display of matrices with application to principal component analysis. Biometrika, 58(3), 453–467.

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✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.