fix(ci): add eslint config, fix conditional hook, add checks permission

- Add .eslintrc.json (was missing, causing lint to always fail)
- Move useMemo above early return in OverviewPage to fix rules-of-hooks
- Remove unused imports in OverviewPage
- Add checks:write permission to test job for dorny/test-reporter

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.eslintrc.json

@@ -0,0 +1,34 @@
+{
+  "env": {
+    "browser": true,
+    "es2021": true
+  },
+  "parser": "@typescript-eslint/parser",
+  "parserOptions": {
+    "ecmaFeatures": { "jsx": true },
+    "sourceType": "module"
+  },
+  "plugins": ["react", "react-hooks", "@typescript-eslint"],
+  "extends": [
+    "eslint:recommended",
+    "plugin:@typescript-eslint/recommended",
+    "plugin:react/recommended",
+    "plugin:react-hooks/recommended"
+  ],
+  "settings": {
+    "react": { "version": "detect" }
+  },
+  "rules": {
+    "react/react-in-jsx-scope": "off",
+    "@typescript-eslint/no-explicit-any": "error",
+    "@typescript-eslint/no-unused-vars": "warn"
+  },
+  "overrides": [
+    {
+      "files": ["**/*.test.ts", "**/*.test.tsx"],
+      "rules": {
+        "@typescript-eslint/no-require-imports": "off"
+      }
+    }
+  ]
+}