Implemented basic app with Mantine SegmentedControl

frontend/package.json

@@ -10,6 +10,10 @@
     "preview": "vite preview"
   },
   "dependencies": {
+    "@mantine/core": "^9.5.1",
+    "@mantine/dates": "^9.5.1",
+    "@mantine/hooks": "^9.5.1",
+    "dayjs": "^1.11.21",
     "react": "^19.2.8",
     "react-dom": "^19.2.8"
   },
@@ -27,6 +31,9 @@
     "eslint-plugin-react-hooks": "^7.1.1",
     "eslint-plugin-react-refresh": "^0.5.3",
     "globals": "^17.7.0",
+    "postcss": "^8.5.26",
+    "postcss-preset-mantine": "^1.18.0",
+    "postcss-simple-vars": "^7.0.1",
     "typescript": "~6.0.2",
     "typescript-eslint": "^8.65.0",
     "vite": "^8.2.0"