test(FN-2360): harden test isolation around repo fusion state

packages/desktop/vitest.config.ts

@@ -1,5 +1,6 @@
 import { defineConfig } from "vitest/config";
 import { cpus } from "node:os";
+import { resolve } from "node:path";
 
 const defaultMaxWorkers = Math.max(1, cpus().length - 1);
 const requestedMaxWorkers = Number.parseInt(process.env.VITEST_MAX_WORKERS ?? String(defaultMaxWorkers), 10);
@@ -8,6 +9,8 @@ process.env.VITEST_MAX_WORKERS = String(maxWorkers);
 
 export default defineConfig({
   test: {
+    setupFiles: [resolve(__dirname, "../core/src/__test-utils__/vitest-setup.ts")],
+    globalSetup: [resolve(__dirname, "../core/src/__test-utils__/vitest-teardown.ts")],
     testTimeout: 30_000,
     hookTimeout: 30_000,
     maxWorkers,