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| # Prompt — hover tooltips on the fitness × synergy scatter (highlighted dots) | |
| Add hover to the scatter so the **highlighted** dots (winner, p16, cell_cycle) show their genes + key scores. Frontend-only. **Depends on PROMPT_fitness_synergy_scatter.md being in** (it draws the canvas). Verified the data is all on the module row. No engine/API/airgap change. `tsc` after. | |
| ## Scope — hover only the highlighted dots | |
| Hit-test only the highlighted points (winner + cell_cycle + p16/immune groups) — that's a few dozen, so it's trivially fast, and it keeps the reveal bounded. Do NOT hover-test the ~6,000 faint background dots (they're not revealed, and revealing all of them would break the airgap). | |
| ## Hit-testing on the canvas | |
| - When drawing the highlighted dots, also record each one's screen position + its module: `{ cx, cy, module }` in a ref array. | |
| - On `mousemove` over the canvas, find the nearest highlighted point within ~8px of the cursor; if found, show the tooltip for that module; on mouseout / none-in-range, hide it. | |
| - Tooltip = an absolutely-positioned HTML div over the chart container, following the cursor (clamp to stay on-screen). | |
| ## Tooltip content | |
| For the hovered group show: | |
| - **Genes** (revealed symbols), e.g. `MCM5, MCM2` (winner: `C11orf85, ZFR2`). | |
| - **Source** tag: winner / p16 / cell_cycle (or immune / MMR for CRC) — colour-matched to the dot. | |
| - **GP fitness** = `m.gp_fitness` | |
| - **Combined AUROC** = `m.combined_holdout` | |
| - **Coherence** = `m.coherence` | |
| - **Synergy** = `m.combined_holdout − max(per_gene single_gene_metric)` (the same value the table/column uses; reuse the shared helper, don't recompute inconsistently). | |
| - (Optionally size = `m.size`.) | |
| Format every number through the existing `fmtFit` so non-finite shows "—". | |
| ## Revealing the gene symbols (bounded) | |
| - The highlighted groups may include modules not on the current table page, so their symbols may not be revealed yet. On scatter mount, batch-reveal the **union of the highlighted groups' `gene_ids`** in one `postReveal` call (winner + all `ref_sets`-tagged groups). This is bounded (a few dozen groups × a few genes — ~100-200 ids), same discipline as revealing the reference sets. Cache `symbolByOpaque` and use it in the tooltip. | |
| - Never reveal the background groups' genes. | |
| ## CONSTRAINTS | |
| - Frontend-only; scores are already on the row, symbols via a bounded reveal of the highlighted groups only. No engine/API/airgap change. | |
| - Keep hover restricted to highlighted dots (fast + bounded reveal). | |
| ## Checkpoint | |
| - Hovering a winner / p16 / cell_cycle dot shows a tooltip with its gene symbols + GP fitness, Combined AUROC, Coherence, Synergy (and source). | |
| - Background dots are not hover-targets; no full-map reveal. | |
| - `tsc` clean; no API/airgap change. | |