chore: remove unused dependencies

Signed-off-by: Henrique Dias <mail@hacdias.com>

frontend/package.json

@@ -22,7 +22,6 @@
     "@vueuse/core": "^14.0.0",
     "@vueuse/integrations": "^14.0.0",
     "ace-builds": "^1.43.2",
-    "core-js": "^3.44.0",
     "dayjs": "^1.11.13",
     "dompurify": "^3.2.6",
     "epubjs": "^0.3.93",
@@ -62,12 +61,10 @@
     "@vue/eslint-config-typescript": "^14.6.0",
     "@vue/tsconfig": "^0.7.0",
     "autoprefixer": "^10.4.21",
-    "concurrently": "^9.2.0",
     "eslint": "^9.31.0",
     "eslint-config-prettier": "^10.1.5",
     "eslint-plugin-prettier": "^5.5.1",
     "eslint-plugin-vue": "^10.5.1",
-    "jsdom": "^27.2.0",
     "postcss": "^8.5.6",
     "prettier": "^3.6.2",
     "terser": "^5.43.1",