feat: enhance UI with Lucide icons across various components

- add logo
- Replaced emoji placeholders with Lucide icons in AITradersPage, CompetitionPage, EquityChart, Header, LoginPage, and RegisterPage for improved visual consistency.
- Updated button styles to include icons for actions like adding models and exchanges.
- Enhanced error and empty state displays with relevant icons to provide better user feedback.

web/package-lock.json

@@ -10,6 +10,7 @@
       "dependencies": {
         "clsx": "^2.1.1",
         "date-fns": "^4.1.0",
+        "lucide-react": "^0.552.0",
         "react": "^18.3.1",
         "react-dom": "^18.3.1",
         "recharts": "^2.15.2",
@@ -2156,6 +2157,15 @@
         "yallist": "^3.0.2"
       }
     },
+    "node_modules/lucide-react": {
+      "version": "0.552.0",
+      "resolved": "https://registry.npmmirror.com/lucide-react/-/lucide-react-0.552.0.tgz",
+      "integrity": "sha512-g9WCjmfwqbexSnZE+2cl21PCfXOcqnGeWeMTNAOGEfpPbm/ZF4YIq77Z8qWrxbu660EKuLB4nSLggoKnCb+isw==",
+      "license": "ISC",
+      "peerDependencies": {
+        "react": "^16.5.1 || ^17.0.0 || ^18.0.0 || ^19.0.0"
+      }
+    },
     "node_modules/merge2": {
       "version": "1.4.1",
       "resolved": "https://registry.npmjs.org/merge2/-/merge2-1.4.1.tgz",