- ensure nanograms are solvable

- add nanogram to games.json, sidebar.html, add screenshot

Author: TobiasMue91

data/games.json

@@ -680,5 +680,16 @@
     "aiPowered": false,
     "featured": false,
     "date": "2025-10-25"
+  },
+  {
+    "id": "nonogram",
+    "title": "Nonogram Puzzle",
+    "description": "Play Nonogram puzzle game online! Solve logic puzzles by filling grids to reveal hidden emoji pictures. Features auto-generated puzzles, drag-to-draw controls, and multiple difficulty levels.",
+    "url": "games/nonogram.html",
+    "screenshot": "screenshots/screenshot_228.webp",
+    "type": "game",
+    "aiPowered": false,
+    "featured": false,
+    "date": "2025-10-26"
   }
 ]