Add Krake boss with ink, pull marks and sweep tentacles plus boss mode

web/src/InkPuddle.ts

@@ -0,0 +1,78 @@
+import * as THREE from 'three';
+import type { Game } from './Game';
+
+const TICK = 0.5;
+const TICK_DAMAGE = 4;
+const SLOW_REFRESH = 0.15;
+
+export class InkPuddle {
+  body: THREE.Group;
+  private radius: number;
+  private life: number;
+  private tickTimer = 0;
+  private puffs: THREE.Mesh[] = [];
+
+  constructor(position: THREE.Vector3, radius = 3.5, duration = 6) {
+    this.radius = radius;
+    this.life = duration;
+    this.body = new THREE.Group();
+    this.body.position.set(position.x, 0.1, position.z);
+
+    const puffGeom = new THREE.SphereGeometry(1, 12, 10);
+    const puffMat = new THREE.MeshToonMaterial({
+      color: 0x552277,
+      transparent: true,
+      opacity: 0.35,
+      depthWrite: false,
+    });
+
+    for (let i = 0; i < 6; i++) {
+      const puff = new THREE.Mesh(puffGeom, puffMat);
+      const a = (i / 6) * Math.PI * 2;
+      puff.position.set(
+        Math.cos(a) * this.radius * 0.4,
+        0.3 + Math.random() * 0.3,
+        Math.sin(a) * this.radius * 0.4
+      );
+      puff.scale.setScalar(this.radius * (0.22 + Math.random() * 0.12));
+      this.body.add(puff);
+      this.puffs.push(puff);
+    }
+  }
+
+  update(dt: number, game: Game): boolean {
+    this.life -= dt;
+    if (this.life <= 0) return false;
+
+    const fade = Math.min(1, this.life / 0.6);
+    for (const puff of this.puffs) {
+      (puff.material as THREE.MeshToonMaterial).opacity = 0.35 * fade;
+      puff.rotation.y += dt * 0.3;
+    }
+
+    if (game.player.health > 0) {
+      const dist = Math.hypot(
+        game.player.body.position.x - this.body.position.x,
+        game.player.body.position.z - this.body.position.z
+      );
+      if (dist < this.radius) {
+        game.player.slowTimer = SLOW_REFRESH;
+        this.tickTimer -= dt;
+        if (this.tickTimer <= 0) {
+          this.tickTimer = TICK;
+          game.player.damage(TICK_DAMAGE, this.body.position);
+          game.triggerInkVignette();
+        }
+      }
+    }
+    return true;
+  }
+
+  dispose() {
+    this.body.removeFromParent();
+    for (const puff of this.puffs) {
+      puff.geometry.dispose();
+      (puff.material as THREE.Material).dispose();
+    }
+  }
+}