manual bump to gts 7, and necessary code nits

cirq-web/cirq_web/eslint.config.cjs

@@ -0,0 +1,21 @@
+module.exports = [
+  ...require('gts'),
+  {
+    ignores: [
+      'build/',
+      '**/node_modules/',
+      '**/dist/',
+      'vitest.config.ts',
+      'vitest.setup.ts',
+      'vite.config.ts',
+      'vitest.e2e.config.ts',
+    ],
+  },
+  {
+    files: ['**/*.ts'],
+    rules: {
+      'n/no-unpublished-import': 'off',
+      'max-len': ['error', 100],
+    },
+  },
+];