Initial commit

**Motivations:**
- Initialisation du versionning git pour le projet

**Root causes:**
- N/A (Nouveau projet)

**Correctifs:**
- N/A

**Evolutions:**
- Structure initiale du projet
- Ajout du .gitignore

**Pages affectées:**
- Tous les fichiers

web/js/animal-visits.js

@@ -0,0 +1,45 @@
+/**
+ * Animals disappear after a duration without any visitor on their cell.
+ * Visitors are simulated at their current orbit position; cells under a visitor get lastVisitedAt updated.
+ * Death removal is handled by checkDeathCauses in food.js.
+ */
+
+import { getVisitorCount } from "./income.js";
+import { getAttractionCenter, getVisitorPosition, getCellKeyFromPixelPosition } from "./visitor-attraction.js";
+
+/**
+ * Update lastVisitedAt for animal cells when a visitor is on that cell.
+ * Does not remove animals; checkDeathCauses(state, nowUnix) handles death from no visit.
+ * @param {import("./types.js").GameState} state
+ * @param {number} nowUnix
+ * @param {number} nowMs
+ */
+export function tickAnimalVisits(state, nowUnix, nowMs) {
+  const gridWidth = state.grid.width;
+  const gridHeight = state.grid.height;
+  const cells = state.grid.cells;
+
+  const visitorCount = getVisitorCount(state);
+  if (visitorCount > 0) {
+    const { centerX, centerY } = getAttractionCenter(state, gridWidth, gridHeight);
+    const t = nowMs / 1000;
+    for (let i = 0; i < visitorCount; i++) {
+      const { px, py } = getVisitorPosition({
+        i,
+        n: visitorCount,
+        t,
+        centerX,
+        centerY,
+        gridWidth,
+        gridHeight,
+      });
+      const key = getCellKeyFromPixelPosition(px, py, gridWidth, gridHeight);
+      if (key !== "") {
+        const cell = cells[key];
+        if (cell !== null && cell !== undefined && cell.kind === "animal") {
+          cell.lastVisitedAt = nowUnix;
+        }
+      }
+    }
+  }
+}