Add generated PNG icons and icon generator script

- icon-192.png
- icon-512.png
- apple-touch-icon.png
- icon-maskable.png
- generate-icons.js script

frontend/package-lock.json

@@ -37,6 +37,7 @@
         "@types/react-dom": "^19",
         "eslint": "^9",
         "eslint-config-next": "16.2.1",
+        "sharp": "^0.34.5",
         "tailwindcss": "^4",
         "typescript": "^5"
       }
@@ -1054,8 +1055,8 @@
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/@img/colour/-/colour-1.1.0.tgz",
       "integrity": "sha512-Td76q7j57o/tLVdgS746cYARfSyxk8iEfRxewL9h4OMzYhbW4TAcppl0mT4eyqXddh6L/jwoM75mo7ixa/pCeQ==",
+      "devOptional": true,
       "license": "MIT",
-      "optional": true,
       "engines": {
         "node": ">=18"
       }
@@ -8785,9 +8786,9 @@
       "version": "0.34.5",
       "resolved": "https://registry.npmjs.org/sharp/-/sharp-0.34.5.tgz",
       "integrity": "sha512-Ou9I5Ft9WNcCbXrU9cMgPBcCK8LiwLqcbywW3t4oDV37n1pzpuNLsYiAV8eODnjbtQlSDwZ2cUEeQz4E54Hltg==",
+      "devOptional": true,
       "hasInstallScript": true,
       "license": "Apache-2.0",
-      "optional": true,
       "dependencies": {
         "@img/colour": "^1.0.0",
         "detect-libc": "^2.1.2",
@@ -8830,8 +8831,8 @@
       "version": "7.7.4",
       "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.4.tgz",
       "integrity": "sha512-vFKC2IEtQnVhpT78h1Yp8wzwrf8CM+MzKMHGJZfBtzhZNycRFnXsHk6E5TxIkkMsgNS7mdX3AGB7x2QM2di4lA==",
+      "devOptional": true,
       "license": "ISC",
-      "optional": true,
       "bin": {
         "semver": "bin/semver.js"
       },