adapt typescript to strict mode

package-lock.json

@@ -48,6 +48,7 @@
         "@types/cytoscape-cxtmenu": "^3.4.5",
         "@types/cytoscape-klay": "^3.1.5",
         "@types/js-cookie": "^3.0.6",
+        "@types/node": "^26.1.1",
         "rollup-plugin-visualizer": "^7.0.1",
         "typescript": "^6.0.3",
         "vite": "^8.1.0"
@@ -2511,6 +2512,16 @@
       "integrity": "sha512-a79Yc3TOk6dGdituy8hmTTJXjOkZ7zsFYV10L337ttq/rec8lRMDBpV7fL3uLx6TgbFCa5DU/h8FmIBQPSbU0w==",
       "license": "MIT"
     },
+    "node_modules/@types/node": {
+      "version": "26.1.1",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-26.1.1.tgz",
+      "integrity": "sha512-nxAkRSVkN1Y0JC1W8ky/fTfkGsMmcrRsbx+3XoZE+rMOX71kLYTV7fLXpqud1GpbpP5TuffXFqfX7fH2GgZREw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "undici-types": "~8.3.0"
+      }
+    },
     "node_modules/@types/tern": {
       "version": "0.23.9",
       "resolved": "https://registry.npmjs.org/@types/tern/-/tern-0.23.9.tgz",
@@ -4654,6 +4665,13 @@
       "integrity": "sha512-Z1YkJ7IIYNrFeOxAlHUercY4Q2I+PhYD/3VkWpJGy/Oqudy3bFpNcQxnv6Oa9fTSXCHPGz1eDoX1bZYm2Z891A==",
       "license": "BSD-3-Clause"
     },
+    "node_modules/undici-types": {
+      "version": "8.3.0",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-8.3.0.tgz",
+      "integrity": "sha512-j375ScV60dom+YkPFIfTLcOiPxkN/buHz5GobjLhixFuANaNs3C9l4GmrWqejgXWJ7BbJcFYpTEUkS1Ge8bpZQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/unicode-canonical-property-names-ecmascript": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/unicode-canonical-property-names-ecmascript/-/unicode-canonical-property-names-ecmascript-2.0.1.tgz",