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/ui-world-map-cities.js

@@ -0,0 +1,33 @@
+import { GameConfig } from "./config.js";
+
+/**
+ * @param {{ worldMapEl: HTMLElement }} ctx
+ */
+export function renderCities(ctx) {
+  const cities = GameConfig.WorldMap?.Cities ?? [];
+  for (const city of cities) {
+    const cityEl = document.createElement("div");
+    cityEl.className = "world-map-city";
+    cityEl.style.left = `${city.x}%`;
+    cityEl.style.top = `${city.y}%`;
+    const maxVisitors = city.maxVisitorsTowardZoos ?? 0;
+    cityEl.title = maxVisitors > 0 ? `${city.name} — max ${maxVisitors} visiteurs vers zoos` : city.name;
+    cityEl.setAttribute("aria-label", maxVisitors > 0 ? `${city.name}, ${maxVisitors} visiteurs max vers zoos` : city.name);
+    const icon = document.createElement("span");
+    icon.setAttribute("aria-hidden", "true");
+    icon.textContent = "🏙️";
+    cityEl.appendChild(icon);
+    const cityLabel = document.createElement("div");
+    cityLabel.className = "world-map-city-label";
+    cityLabel.textContent = city.name;
+    cityEl.appendChild(cityLabel);
+    if (maxVisitors > 0) {
+      const cityMax = document.createElement("div");
+      cityMax.className = "world-map-city-max-visitors";
+      cityMax.textContent = `max ${maxVisitors}`;
+      cityMax.setAttribute("aria-hidden", "true");
+      cityEl.appendChild(cityMax);
+    }
+    ctx.worldMapEl.appendChild(cityEl);
+  }
+}