Migrate Box2D to Planck.js in core game logic, items, debug draw, and menu. Remove legacy Box2D references, update level and item loading, and improve debug draw for Planck.

.vscode/launch.json

@@ -0,0 +1,16 @@
+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "node",
+            "request": "launch",
+            "name": "npm start",
+            "runtimeExecutable": "npm",
+            "runtimeArgs": [
+                "start"
+            ],
+            "port": 9229,
+            "console": "integratedTerminal"
+        }
+    ]
+}