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/zoo-placement.js

@@ -0,0 +1,90 @@
+import { LootTables } from "./loot-tables.js";
+import { canPlaceMultiCell } from "./placement.js";
+
+/**
+ * @param {import("./types.js").GameState} state
+ * @param {string} nurseryCellKey
+ * @param {number} nowUnix
+ * @returns {[false, string] | [true, import("./types.js").PendingBaby]}
+ */
+function getMatureBabyReady(state, nurseryCellKey, nowUnix) {
+  const baby = (state.pendingBabies ?? []).find((p) => p.nurseryCellKey === nurseryCellKey);
+  if (baby === null || baby === undefined) return [false, "NoBaby"];
+  if (nowUnix < baby.readyAt) return [false, "BabyNotReady"];
+  return [true, baby];
+}
+
+/**
+ * @param {import("./types.js").GameState} state
+ * @param {{ nurseryCellKey: string, toX: number, toY: number, nowUnix: number }} opts
+ * @returns {[false, string] | [true, import("./types.js").AnimalCell]}
+ */
+export function getMatureBabyPlacementData(state, opts) {
+  const { nurseryCellKey, toX, toY, nowUnix } = opts;
+  const babyResult = getMatureBabyReady(state, nurseryCellKey, nowUnix);
+  if (babyResult[0] === false) return [false, babyResult[1]];
+  const baby = babyResult[1];
+  const def = LootTables.Animals[baby.animalId];
+  if (def === null || def === undefined) return [false, "UnknownAnimal"];
+  const w = def.cellsWide ?? 1;
+  const h = def.cellsHigh ?? 1;
+  const [ok, reason] = canPlaceMultiCell(state, { originX: toX, originY: toY, w, h });
+  if (!ok) return [false, reason ?? "NoPlace"];
+  const animalData = {
+    kind: "animal",
+    id: baby.animalId,
+    mutation: "none",
+    level: 1,
+    placedAt: nowUnix,
+    lastVisitedAt: nowUnix,
+    lastFedAt: nowUnix,
+    cellsWide: w,
+    cellsHigh: h,
+    fromOtherZoo: baby.fromOtherZoo === true,
+  };
+  return [true, animalData];
+}
+
+/**
+ * @param {import("./types.js").GameState} state
+ * @param {string} receptionCellKey
+ * @param {number} nowUnix
+ * @returns {[false, string] | [true, import("./types.js").ReceptionAnimal]}
+ */
+function getReceptionAnimalReady(state, receptionCellKey, nowUnix) {
+  const rec = (state.receptionAnimals ?? []).find((r) => r.receptionCellKey === receptionCellKey);
+  if (rec === null || rec === undefined) return [false, "NoReceptionAnimal"];
+  if (nowUnix < rec.readyAt) return [false, "AnimalNotReady"];
+  return [true, rec];
+}
+
+/**
+ * @param {import("./types.js").GameState} state
+ * @param {{ receptionCellKey: string, toX: number, toY: number, nowUnix: number }} opts
+ * @returns {[false, string] | [true, import("./types.js").AnimalCell]}
+ */
+export function getReceptionAnimalPlacementData(state, opts) {
+  const { receptionCellKey, toX, toY, nowUnix } = opts;
+  const recResult = getReceptionAnimalReady(state, receptionCellKey, nowUnix);
+  if (recResult[0] === false) return [false, recResult[1]];
+  const rec = recResult[1];
+  const def = LootTables.Animals[rec.animalId];
+  if (def === null || def === undefined) return [false, "UnknownAnimal"];
+  const w = def.cellsWide ?? 1;
+  const h = def.cellsHigh ?? 1;
+  const [ok, reason] = canPlaceMultiCell(state, { originX: toX, originY: toY, w, h });
+  if (!ok) return [false, reason ?? "NoPlace"];
+  const animalData = {
+    kind: "animal",
+    id: rec.animalId,
+    mutation: "none",
+    level: 1,
+    placedAt: nowUnix,
+    lastVisitedAt: nowUnix,
+    lastFedAt: nowUnix,
+    cellsWide: w,
+    cellsHigh: h,
+    fromOtherZoo: true,
+  };
+  return [true, animalData];
+}