Seven pages repeated the same load-on-mount + loading + try/finally +
reload-button skeleton, each re-implementing tab-active refresh, silent
polling, and (in two places) a hand-rolled requestId race guard. Extract two
composable hooks: useResource(fetcher, {tabPath, deps}) owning data/loading/
reload with a built-in race guard and auto tab-active refresh, and
usePolling(fn, ms, enabled) replacing the hand-written setInterval effects.
Migrate all seven pages onto them; Targets/Scenarios/ModelConfigs also gain a
uniform tab-active refresh they previously lacked. Verified via tsc --noEmit
and npm run build (no frontend test runner exists).
Give EvalRun.summary a typed RunSummary value (unified RunError, lenient
legacy parsing) so readers stop reaching into a schemaless dict, and route
every cross-run rollup — dashboard, scenario ranking, trend, campaign
report — through one aggregate_runs seam. Fixes the divergence where
stats averaged pass_rate over completed-only runs while the campaign
report counted faults as 0.0. Cross-run rule (ADR-0004): genuine faults
count 0.0, user-cancelled runs are excluded from both denominators.
