feat(web): tooltips on the affect-derived cells (v0.20.5)
Native title hints on all 6 affect-derived cells (samples / updated / baseline P·A / drift Δv / volatility) — each explains what it measures and its Tier-1 vs Tier-3 availability. Completes the mouseover-hint pass (PAD faders + relation rows already had them). Verified: pytest tests/test_web_* (84) + node Playwright (all 6 cells titled).
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