chore(eslint): 🔧 Update ESLint config to enforce stricter linting rules

Co-Authored-By: Lilith Autocommit <noreply@atlilith.com>

@packages/companion-client/eslint.config.js

@@ -0,0 +1,6 @@
+import { createBaseConfig } from '@lilith/configs/eslint/base-flat';
+import tseslint from 'typescript-eslint';
+
+export default tseslint.config(
+  ...createBaseConfig({ tsconfigRootDir: import.meta.dirname }),
+);