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fix(web): home sections below the hero never stay hidden (E-065) + two doc facts - #4
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…s: Python ≥3.12, I1–I19 useReveal ran on every render; the backdrop's mount re-render disconnected the observer and cancelled the safety timer, leaving all 18 [data-reveal] sections at opacity 0 (measured live). Effect now runs once per mount, re-adopts hidden elements, reveals all on cleanup. Verified: production build in Chromium with the backdrop -> 0/18 hidden; vitest 34/34 (+2 that fail on the old hook). README layout line Python 3.13 -> >=3.12; AI_USAGE I1-I11 -> I1-I19.
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P0 on the live home page: on capable devices (where the WebGL backdrop mounts ~1 s after load) every section below the hero stayed at opacity 0 — measured live: 18/18
[data-reveal]hidden after a full scroll (0/18 on a 2-core device where the backdrop is skipped). Cause:useRevealre-ran on every render; the backdrop re-render disconnected the observer and cancelled the safety timer, and the new run selected[data-reveal]:not([data-in])= nothing.Fix: effect runs once per mount, re-adopts already-hidden elements, reveals everything on cleanup.
Measured: production build in Chromium with the backdrop → 0/18 hidden; vitest 34/34 (+2 regression tests that fail on the old hook); tsc, oxlint 0 errors, build ok.
Docs: README layout line
Python 3.13→≥ 3.12(matches pyproject); AI_USAGEI1–I11→I1–I19(matches SAFETY). E-065 in DECISIONS, CHANGELOG Fixed.(The earlier bot health-dependency content of this PR is already on main via c39d9f1/2fb4b0e.)