Add Chessboard Repaint Puzzle - a challenging parity puzzle

src/components/InteractiveIndex.tsx

@@ -91,6 +91,15 @@ const allInteractives: Interactive[] = [
     theme: 'Puzzles',
     dateAdded: '2024-12-19'
   },
+  {
+    id: 'chessboard-repaint',
+    title: 'Chessboard Repaint Puzzle',
+    description: 'Repaint rows, columns, or 2×2 squares to achieve exactly one black square. A puzzle about parity and operations!',
+    tags: ['logic', 'parity', 'strategy', 'puzzle', 'chessboard', 'operations'],
+    path: '/puzzles/chessboard-repaint',
+    theme: 'Puzzles',
+    dateAdded: '2024-12-19'
+  },
   {
     id: 'knights-puzzle',
     title: 'Knights Exchange Puzzle',