feat(reports): leftover-map singular values on leftover-axis report badges (v2.79.0)

[seonghobae]

Summary

• Caption leftover-axis report badges with persisted leftover-map singular values σ_k (ADR 0322 / v2.79.0).
• After make seed, leftover-axis badges name persisted leftover-map singular values when finite together with persisted leftover-map axis share; click a leftover pair opens that post.
• Pair-list leftover-axis badges stay leftover axis {k} σ {value} {share}% so they stay distinct from hyphen leftover-map axis {k} σ {value} ({share}%) and from comparison copy leftover map comparison graphic leftover-map axis {k} σ {value} ({share}%).
• A missing, non-finite, or negative singular value omits that σ badge and keeps leftover axis {k} {share}%. Rank-0 unused axes still name σ 0.00. Do not invent σ_k from leftover-map axis share.
• UI-only; no SQL; no new columns. Never invent a leftover score. Never invent a theta. Do not persist leftover-map inner product, cosine, or length. This increment does not caption leftover-map singular values on leftover-axis badges on the grouping comparison strip with a distinct name.
• Stacked onto leftover-map singular values on grouping comparison leftover-map graphic (feat/leftover-map-compare-plot-singular-v2780 / feat(reports): leftover-map singular values on grouping comparison graphic (v2.78.0) #861 @ 3aac452). 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. Issues Milestone 2: port verified direct-PostgreSQL analysis into the protected product architecture #79 and Milestone 2.1: add normalized runtime-analysis schema bridge after v0.77 #87 stay open. Do not merge revert: undo #782 squash until independent APPROVE #808 without independent APPROVE.

Test plan

• leftoverMapAxisBadge.test.ts reads 1.84/0.86, names rank-0 0, omits NaN/Infinity/null/negative, does not invent σ from leftover-map axis share, keeps leftover-axis badge copy distinct from hyphen graphic σ, comparison graphic σ, and share-only leftover-axis copy
• leftoverMapPlotAxisSingular.test.ts comparison graphic σ stays distinct from leftover-axis badge σ {value} {share}%
• App.test.tsx leftover-axis report badges name leftover axis 1 σ 1.84 82% / leftover axis 2 σ 0.86 18%; grouping comparison does not gain leftover-axis badge copy; comparison graphic keeps leftover map comparison graphic leftover-map axis σ
• LeftoverMapPlot.test.tsx comparison graphic still omits leftover axis 1 σ 1.84 82%
• i18n.test.ts required keys for leftover-axis badge σ + share in ko/zh/ja/vi
• frontend oxlint on changed files: 0 warnings, 0 errors
• frontend vitest: 569 tests passed (App.test.tsx, LeftoverMapPlot.test.tsx, LeftoverPairList.test.tsx, i18n.test.ts, leftover-map helpers)
• CI Full test suite and Frontend lint, test, build on this exact head
• After make seed, leftover-axis report badges name leftover-map singular values; click opens that post.

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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[seonghobae]

Exact head f24b664ce88bb2b3898fcaa0fd0ee7f69c5e12f7 stacked on #861 @ 3aac452. Copilot/Devin review is not independent APPROVE. Leave this PR open. Do not squash-merge. Do not self-approve. Issues #79 and #87 stay open.

[devin-ai-integration]

✅ Devin Review: No Issues Found

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