The useEffect that auto-selects the Primary/Secondary tab was calling
setComparePhase() without updating selectedMetric. When a URL carries a
primary metric (e.g. metric=rwm_expected_pct) but the shortlisted schools
are secondary, the tab would switch to Secondary while the metric stayed
at rwm_expected_pct — which is null for all secondary schools, causing
every card to show "–" and requiring a manual tab toggle to fix.
Fix: after determining the phase from school data, check whether the
current metric belongs to that phase's category list. If not, reset to
the phase default (attainment_8_score for secondary, rwm_expected_pct
for primary). A metric that already fits the phase (e.g. the URL already
carried attainment_8_score) is preserved unchanged.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Tudor Sitaru
2e3456b21b