Add comprehensive messenger features and improvements

- Backend improvements: flexible user authentication, nullable fields
- Frontend enhancements: new screens (NewMessage, UserInfo), improved UI/UX
- Chat functionality: real-time messaging with polling, message actions
- Visual upgrades: gradient backgrounds, better themes, modern design
- Added project documentation (CLAUDE.md) and development guidelines

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/package-lock.json

@@ -19,6 +19,7 @@
         "expo-linear-gradient": "~14.1.5",
         "expo-status-bar": "~2.2.3",
         "graphql": "^16.11.0",
+        "graphql-ws": "^6.0.6",
         "react": "19.0.0",
         "react-dom": "19.0.0",
         "react-native": "0.79.5",
@@ -4836,6 +4837,36 @@
         "graphql": "^0.9.0 || ^0.10.0 || ^0.11.0 || ^0.12.0 || ^0.13.0 || ^14.0.0 || ^15.0.0 || ^16.0.0"
       }
     },
+    "node_modules/graphql-ws": {
+      "version": "6.0.6",
+      "resolved": "https://registry.npmjs.org/graphql-ws/-/graphql-ws-6.0.6.tgz",
+      "integrity": "sha512-zgfER9s+ftkGKUZgc0xbx8T7/HMO4AV5/YuYiFc+AtgcO5T0v8AxYYNQ+ltzuzDZgNkYJaFspm5MMYLjQzrkmw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=20"
+      },
+      "peerDependencies": {
+        "@fastify/websocket": "^10 || ^11",
+        "crossws": "~0.3",
+        "graphql": "^15.10.1 || ^16",
+        "uWebSockets.js": "^20",
+        "ws": "^8"
+      },
+      "peerDependenciesMeta": {
+        "@fastify/websocket": {
+          "optional": true
+        },
+        "crossws": {
+          "optional": true
+        },
+        "uWebSockets.js": {
+          "optional": true
+        },
+        "ws": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/has-flag": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-4.0.0.tgz",