fix: add module=esnext to tsconfig for dynamic import support

The async import() in vi.mock factories requires module=esnext in
tsconfig. Without this, tsc reports TS1323 for all component test files.

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

tsconfig.json

@@ -1,6 +1,7 @@
 {
   "extends": "@kinvolk/headlamp-plugin/config/plugins-tsconfig.json",
   "compilerOptions": {
+    "module": "esnext",
     "types": ["vite/client", "vite-plugin-svgr/client", "vitest/globals", "@testing-library/jest-dom"]
   },
   "include": ["src"]