test(#828): verify grouping axis-share accessible semantics

[seonghobae]

Draft repair-validation lane for #828. Base is exact product #828 7b6dbbb99a09d0523bce43c6872bbd9fa382a43a; do not merge while the exact-head GREEN and product repair are incomplete.

Fresh current-head review found the grouping-comparison axis-share badge is a plain <span> carrying aria-label. Its implicit ARIA role is generic, for which author-provided accessible naming is prohibited. The visible localized persisted σ²/Σσ² text must remain ordinary readable content; do not add a synthetic role, recompute/clamp the psychometric value, or change translation ownership.

The first validation attempt was not product evidence: its source anchor had drifted and failed before reaching the intended assertion. Commit 1472d98b7513c360ca1c7cf6da4a401a716bc53c repairs only that harness anchor. Hosted run 34171799327, frontend job 101893369069, is now a realistic RED: lint passes, existing App.test.tsx tests pass, and the sole failing new regression is leftoverMapCompareAxisAccessibility.test.ts, which sees the current axis-share block's aria-label={t(LEFTOVER_MAP_COMPARE_AXIS_SHARE_LABEL)}. Result at that step: 65 test files passed and 1 failed; 729 tests passed and 1 failed. Build/Storybook are correctly skipped after the intentional RED.

Minimal causal repair remains exactly two source deletions in frontend/src/App.tsx: remove the unused LEFTOVER_MAP_COMPARE_AXIS_SHARE_LABEL import and remove the aria-label from that axis-share post-badge. Preserve the visible tf(LEFTOVER_MAP_COMPARE_AXIS_SHARE, comparisonAxisShare) output. After repair, require fresh lint/test/build/Storybook plus repository-required exact-head gates before promotion.

This finding belongs to #828, the earliest owner of the axis-share presentation. #829/#830/#831 evidence cannot be promoted across a repaired #828 parent without fresh non-force descendant convergence. Keep historical product ancestry; no force-push, destructive rebase, self-approval, synthetic status, or workflow-based source mutation.

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