Refine archive world spawn and interaction handling

assets/scripts/pages/archive-world-systems.js

@@ -193,9 +193,47 @@
     return Boolean(area && (area.safeZones || []).some((item) => pointInRect(x, y, item, 0)));
   }
 
+  function interactionRadius(item) {
+    return {
+      npc: 46,
+      landmark: 64,
+      portal: 58,
+      chest: 48,
+      challenge: 52,
+      "boss-memory": 50
+    }[item && item.type] || 44;
+  }
+
+  function nearestInteraction(items, x, y) {
+    let nearest = null;
+    let best = Infinity;
+    (Array.isArray(items) ? items : []).forEach((item) => {
+      if (!item || !Number.isFinite(item.x) || !Number.isFinite(item.y)) return;
+      const distance = Math.hypot(item.x - x, item.y - y);
+      if (distance <= interactionRadius(item) && distance < best) {
+        nearest = item;
+        best = distance;
+      }
+    });
+    return nearest;
+  }
+
+  function safeSpawnForState(state) {
+    const position = state && state.position;
+    const gate = Data.AREAS.town.gates && Data.AREAS.town.gates[0];
+    const gateLocked = state && Array.isArray(state.sigils) && !state.sigils.includes("gate");
+    if (position && position.area === "town" && gate && gateLocked && position.y < gate.y + gate.height) {
+      return nearestNamedSafeSpawn("town", Data.AREAS.town.safeSpawns.gate.x, Data.AREAS.town.safeSpawns.gate.y);
+    }
+    return nearestSafeSpawn(
+      position && position.area || "town",
+      position && position.x,
+      position && position.y
+    );
+  }
+
   function nearestSafeSpawn(areaId, x, y) {
     const area = Data.AREAS[areaId] || Data.AREAS.town;
-    const points = Object.entries(area.safeSpawns || { entrance: area.spawn });
     const safeCurrent = isSafe(areaId, x, y);
     if (safeCurrent) return { area: areaId, spawn: "saved", x, y };
     return nearestNamedSafeSpawn(areaId, x, y);
@@ -223,6 +261,7 @@
   return Object.freeze({
     normalizedVector, approachVelocity, discover, startQuest, progressQuest, completeQuest, updateStory, addItem, itemQuantity,
     consumeItem, grantXp, takeDamage, respawn, recordBoss, isSafe, isCombatSafe,
+    interactionRadius, nearestInteraction, safeSpawnForState,
     nearestSafeSpawn, nearestNamedSafeSpawn, currentObjective
   });
 }));