Perceived-latency P1: ETag/304, deferred tab fetches, lazy widgets#28014

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Commits on May 10, 2026

feat(ui-perf): If-None-Match → 304 short-circuit + client ETag cache

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feat(ui-perf): defer Queries-tab fetch until tab activated

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feat(ui-perf): lazy-mount below-fold widgets on landing page

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fix(ui-perf): address PR review feedback for P1 perceived-latency

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test(ui-perf): unblock tests against DeferredWidget on landing page

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test(ui): force single React copy for core-components in jest

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Commits on May 11, 2026

revert(ui-perf): drop P1.3 DeferredWidget — broke Playwright shards

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