fix: add tsconfig.json, @types/chrome, fix TS errors - CI typecheck now passes

package-lock.json

@@ -18,6 +18,7 @@
       },
       "devDependencies": {
         "@playwright/test": "^1.50.1",
+        "@types/chrome": "^0.1.37",
         "@types/react": "^18.3.1",
         "@types/react-dom": "^18.3.1",
         "autoprefixer": "^10.4.20",
@@ -1399,6 +1400,17 @@
         "assertion-error": "^2.0.1"
       }
     },
+    "node_modules/@types/chrome": {
+      "version": "0.1.37",
+      "resolved": "https://registry.npmjs.org/@types/chrome/-/chrome-0.1.37.tgz",
+      "integrity": "sha512-IJE4ceuDO7lrEuua7Pow47zwNcI8E6qqkowRP7aFPaZ0lrjxh6y836OPqqkIZeTX64FTogbw+4RNH0+QrweCTQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/filesystem": "*",
+        "@types/har-format": "*"
+      }
+    },
     "node_modules/@types/deep-eql": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/@types/deep-eql/-/deep-eql-4.0.2.tgz",