Fix poster selection and cart

package.json

@@ -3,13 +3,13 @@
   "version": "0.1.0",
   "homepage": "https://hugyouu.github.io/Letterboxd-Diary-Posters-Picker",
   "dependencies": {
-    "@emotion/react": "^11.13.3",
-    "@emotion/styled": "^11.13.0",
+    "@emotion/react": "^11.14.0",
+    "@emotion/styled": "^11.14.0",
     "@material-ui/core": "^4.12.4",
     "@material-ui/icons": "^4.11.3",
     "@mui/icons-material": "^6.0.1",
     "@mui/lab": "^6.0.0-beta.9",
-    "@mui/material": "^6.0.1",
+    "@mui/material": "^6.2.0",
     "@testing-library/jest-dom": "^5.17.0",
     "@testing-library/react": "^13.4.0",
     "@testing-library/user-event": "^13.5.0",
@@ -24,6 +24,7 @@
     "react-scripts": "5.0.1",
     "redux": "^5.0.1",
     "redux-persist": "^6.0.0",
+    "reselect": "^5.1.1",
     "sass": "^1.80.3",
     "web-vitals": "^2.1.4"
   },