feat: Integrate @tabler/core for UI enhancements and refactor App component with new sidebar and dashboard features

frontend/package-lock.json

@@ -8,6 +8,7 @@
       "name": "frontend",
       "version": "0.0.0",
       "dependencies": {
+        "@tabler/core": "^1.3.2",
         "@tabler/icons-react": "^3.34.0",
         "axios": "^1.10.0",
         "bootstrap": "^5.3.7",
@@ -642,6 +643,42 @@
         "tslib": "^2.8.0"
       }
     },
+    "node_modules/@tabler/core": {
+      "version": "1.3.2",
+      "resolved": "https://registry.npmjs.org/@tabler/core/-/core-1.3.2.tgz",
+      "integrity": "sha512-QDVJbv48YJrahBLdxYkLi6NutQv4jGbkUWyzxE2NcNJ3s3GGpRx98JmbAoN92NZKNmf26vZdW6k2Q5haVKlS4A==",
+      "license": "MIT",
+      "dependencies": {
+        "@popperjs/core": "^2.11.8",
+        "bootstrap": "5.3.6"
+      },
+      "engines": {
+        "node": ">=20"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/codecalm"
+      }
+    },
+    "node_modules/@tabler/core/node_modules/bootstrap": {
+      "version": "5.3.6",
+      "resolved": "https://registry.npmjs.org/bootstrap/-/bootstrap-5.3.6.tgz",
+      "integrity": "sha512-jX0GAcRzvdwISuvArXn3m7KZscWWFAf1MKBcnzaN02qWMb3jpMoUX4/qgeiGzqyIb4ojulRzs89UCUmGcFSzTA==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/twbs"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/bootstrap"
+        }
+      ],
+      "license": "MIT",
+      "peerDependencies": {
+        "@popperjs/core": "^2.11.8"
+      }
+    },
     "node_modules/@tabler/icons": {
       "version": "3.34.0",
       "resolved": "https://registry.npmjs.org/@tabler/icons/-/icons-3.34.0.tgz",