Added magnet functionality

assets/Scripts/Game/Unit/Player/Magnet.ts

@@ -0,0 +1,33 @@
+import { _decorator, Component, Node, Collider2D, CircleCollider2D } from "cc";
+import { GameTimer } from "../../../Services/GameTimer";
+const { ccclass, property } = _decorator;
+
+@ccclass("Magnet")
+export class Magnet extends Component {
+    @property(CircleCollider2D) private collider: CircleCollider2D;
+
+    private timer: GameTimer;
+    private duration: number;
+
+    public get Collider(): Collider2D {
+        return this.collider;
+    }
+    public init(duration: number): void {
+        this.duration = duration;
+        this.node.active = false;
+    }
+
+    public activate(): void {
+        this.timer = new GameTimer(this.duration);
+        this.node.active = true;
+    }
+
+    public gameTick(deltaTime: number): void {
+        if (!this.node.active) return;
+
+        this.timer.gameTick(deltaTime);
+        if (this.timer.tryFinishPeriod()) {
+            this.node.active = false;
+        }
+    }
+}