Add Subtraction Game interactive

Implement "The Subtraction Game" interactive with sliders for n and k, a play/reset button, turn-based gameplay between two players, and visual feedback including confetti for the winner.

package-lock.json

@@ -38,6 +38,7 @@
         "@radix-ui/react-tooltip": "^1.1.4",
         "@tanstack/react-query": "^5.56.2",
         "@types/qrcode": "^1.5.5",
+        "canvas-confetti": "^1.9.3",
         "class-variance-authority": "^0.7.1",
         "clsx": "^2.1.1",
         "cmdk": "^1.0.0",
@@ -3480,6 +3481,16 @@
       ],
       "license": "CC-BY-4.0"
     },
+    "node_modules/canvas-confetti": {
+      "version": "1.9.3",
+      "resolved": "https://registry.npmjs.org/canvas-confetti/-/canvas-confetti-1.9.3.tgz",
+      "integrity": "sha512-rFfTURMvmVEX1gyXFgn5QMn81bYk70qa0HLzcIOSVEyl57n6o9ItHeBtUSWdvKAPY0xlvBHno4/v3QPrT83q9g==",
+      "license": "ISC",
+      "funding": {
+        "type": "donate",
+        "url": "https://www.paypal.me/kirilvatev"
+      }
+    },
     "node_modules/chalk": {
       "version": "4.1.2",
       "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.2.tgz",