Implement main menu, profile list, and profile stats screens; add screen manager and user profile integration

user_profiles.json

@@ -3,7 +3,7 @@
     "Player1": {
       "name": "Player1",
       "created_date": "2024-01-15T10:30:00",
-      "last_played": "2025-08-21T17:57:06.304649",
+      "last_played": "2025-08-24T21:49:04.187787",
       "games_played": 25,
       "total_score": 15420,
       "best_score": 980,
@@ -23,7 +23,7 @@
     "Alice": {
       "name": "Alice",
       "created_date": "2024-01-10T09:15:00",
-      "last_played": "2025-08-21T17:39:28.013833",
+      "last_played": "2025-08-24T21:48:42.749128",
       "games_played": 43,
       "total_score": 33000,
       "best_score": 1250,
@@ -78,10 +78,10 @@
     "B0B": {
       "name": "B0B",
       "created_date": "2025-08-21T18:03:12.189612",
-      "last_played": "2025-08-21T18:59:35.393040",
+      "last_played": "2025-08-22T14:42:49.357304",
       "games_played": 0,
-      "total_score": 590,
-      "best_score": 590,
+      "total_score": 1410,
+      "best_score": 820,
       "settings": {
         "difficulty": "normal",
         "sound_volume": 50,
@@ -92,5 +92,5 @@
       "achievements": []
     }
   },
-  "active_profile": "B0B"
+  "active_profile": "Player1"
 }