Read docs/PROMPT_survival_encoding_and_help.md

Prompt — encode site-survival on the scatter + plain-language "Survives" help

Two presentation fixes around the confound-survival flags. Frontend-only; the data (survives_site, survives_purity, the subgroup AUROCs) is already on the module row. No engine/API/airgap change. tsc after.

Part 1 — encode site-survival on the scatter (don't hard-remove)

The fitness × synergy scatter currently plots all highlighted groups (winner / cell_cycle / p16) the same, regardless of whether they passed the site confound check. Distinguish them, and let the user declutter:

• Encode site-survival by fill, keeping colour = category (winner teal / cell_cycle amber / p16 gold):
  • survives_site === true → solid dot (as now).
  • survives_site === false → hollow / outline-only (or clearly faded) dot — so failed-site groups read as "less trustworthy" at a glance.
  • survives_site == null (n too small) → solid but with a thin dashed outline, or just treat as solid; keep it simple.
• (Encode site only — purity is mostly "—" here, so it carries no signal; don't encode it.)
• Add a small toggle above/beside the scatter: "Hide groups that fail the site check" (default OFF). When on, drop the survives_site === false highlighted dots from the plot (background grey dots are unaffected).
• Update the scatter legend/caption to note: "solid = survives the site check; hollow = fails it (its signal is partly location)."

Part 2 — add a plain-language "?" on the "Survives" column

In the merged table, the "Survives" column header (<th>Survives</th>, ~Lab.tsx 3741) needs a clear "?" (rewrite TIPS.moduleSurvival, or attach a help trigger right on that header). Use this plain-English copy (anyone should understand it):

What "Survives" checks: whether a group still separates HPV when you take away a possible confounder — something that travels with HPV but isn't HPV biology.

Site. HPV+ tumours are mostly in the oropharynx (back of the throat), so a gene could look like an "HPV gene" just by marking that location. The site check re-scores the group using only oropharynx patients (everyone the same location). The two numbers are full-cohort → oropharynx-only.

Purity. A tumour sample is a mix of cancer cells and immune cells; HPV+ tumours carry more immune cells, so a gene could look like an "HPV gene" just by marking immune content. The purity check re-scores using only the "purest" (least-immune) tumours. It's usually "—" here because those tumours include almost no HPV+ patients, so there's nothing to test.

✓ = held up when the confounder was held constant (likely real signal). ✗ = dropped past the tolerance (part of it was the confounder). — = couldn't test (too few patients).

• Keep the existing per-chip tooltips (the full → subgroup detail) unchanged; this is the column-level explainer.

CONSTRAINTS

• Frontend-only; uses survives_site already on the row. No engine/API/airgap change.

Checkpoint

• Scatter: failed-site highlighted dots render hollow/faded; a "Hide groups that fail the site check" toggle removes them; legend explains solid vs hollow.
• The "Survives" column has a plain-language "?" explaining site, purity, ✓, ✗, and —.
• tsc clean.