feat: Refactor utility and component exports, update dependencies, and add Knip for unused code detection.

frontend/package.json

@@ -7,7 +7,7 @@
     "dev": "webpack serve --mode development --open",
     "build": "webpack --mode production",
     "lint": "eslint src --ext .js,.jsx,.ts,.tsx",
-    "check": "tsc --noEmit && npm run lint",
+    "check": "tsc --noEmit && npx knip && npm run lint",
     "test:engine": "node --test tests/workspaceEngine.test.js"
   },
   "dependencies": {
@@ -15,6 +15,7 @@
     "@tabler/icons-react": "^3.35.0",
     "axios": "^1.13.2",
     "pdfjs-dist": "^5.4.394",
+    "prop-types": "^15.8.1",
     "react": "^19.2.0",
     "react-dom": "^19.2.0",
     "react-redux": "^9.2.0",
@@ -25,18 +26,19 @@
     "@babel/preset-env": "^7.28.5",
     "@babel/preset-react": "^7.28.5",
     "@babel/preset-typescript": "^7.28.5",
+    "@eslint/js": "^9.39.1",
     "@svgr/webpack": "^8.1.0",
     "@typescript-eslint/eslint-plugin": "^8.46.4",
     "@typescript-eslint/parser": "^8.18.1",
     "babel-loader": "^10.0.0",
     "copy-webpack-plugin": "^13.0.1",
     "css-loader": "^7.1.2",
-    "dotenv": "^17.2.3",
     "eslint": "^9.39.1",
     "eslint-plugin-react": "^7.37.5",
     "eslint-plugin-react-hooks": "^7.0.1",
     "globals": "^16.5.0",
     "html-webpack-plugin": "^5.6.4",
+    "knip": "^5.71.0",
     "style-loader": "^4.0.0",
     "typescript": "^5.7.3",
     "webpack": "^5.102.1",