Lint: fix errors and remove unused variables

**Motivations:**
- Ensure lint config is not degraded and fix all lint errors for pousse workflow.

**Root causes:**
- Unused variables kept with _ prefix instead of removed (_row, _questReward, _i).
- getAnimalBlockOrigin had 5 parameters (max 4).
- use of continue statement (no-continue rule).

**Correctifs:**
- ESLint config verified; no eslint-disable in codebase.
- Removed unused variable _row (biome-rules); removed dead function _questReward (quests); removed unused map param _i (state.js).
- getAnimalBlockOrigin refactored to 4 params (pos object instead of x, y).
- Replaced continue with if (cell) block in normalizeLoadedCells (state.js).
- JSDoc param names aligned with _height, _y (biome-rules).

**Evolutions:**
- (none)

**Pages affectées:**
- web/js/biome-rules.js
- web/js/quests.js
- web/js/state.js
- web/js/placement.js

web/js/income-attractivity.js

@@ -0,0 +1,36 @@
+import { LootTables } from "./loot-tables.js";
+import { isOriginCell } from "./grid-utils.js";
+import { getTotalAnimalValue } from "./income-value.js";
+import { getOriginAnimalCount } from "./food.js";
+
+/**
+ * Attractivity from value, species count, rarity and fill rate (before penalties).
+ * @param {import("./types.js").GameState} state
+ * @returns {{ valueNorm: number, speciesNorm: number, rarityNorm: number, fillNorm: number }}
+ */
+export function getAttractivityBase(state) {
+  const value = getTotalAnimalValue(state);
+  const originCount = getOriginAnimalCount(state);
+  const grid = state.grid;
+  const cellCount = grid.width * grid.height;
+  const fillRate = cellCount > 0 ? originCount / cellCount : 0;
+  const speciesSet = new Set();
+  let raritySum = 0;
+  for (const [key, cell] of Object.entries(state.grid.cells)) {
+    if (cell === null || cell === undefined || cell.kind !== "animal" || !isOriginCell(key, cell)) {
+      // skip
+    } else {
+      speciesSet.add(cell.id);
+      const def = LootTables.Animals[cell.id];
+      if (def) raritySum += def.rarityLevel ?? 1;
+    }
+  }
+  const speciesCount = speciesSet.size;
+  const avgRarity = originCount > 0 ? raritySum / originCount : 0;
+  return {
+    valueNorm: value * 0.001,
+    speciesNorm: speciesCount * 2,
+    rarityNorm: avgRarity * 0.5,
+    fillNorm: fillRate * 10,
+  };
+}