feat: ESLint Flat Config (v9 support #2229) (#2426)

* Flat config

* undo accidental formatting changes

* remove extra newline

tsconfig.json

@@ -25,6 +25,7 @@
   "exclude": ["./dist"],
   "include": [
     "electron.vite.config.mts",
-    "./src/**/*"
+    "./src/**/*",
+    "*.config.*js",
   ]
 }