Fix stale app UI (supabase) & overall E2E test infra improvements (#337)

Fixes #269

src/paths/paths.ts

@@ -1,8 +1,9 @@
 import path from "node:path";
 import os from "node:os";
+import { IS_TEST_BUILD } from "../ipc/utils/test_utils";
 
 export function getDyadAppPath(appPath: string): string {
-  if (process.env.E2E_TEST_BUILD) {
+  if (IS_TEST_BUILD) {
     const electron = getElectron();
     return path.join(electron!.app.getPath("userData"), "dyad-apps", appPath);
   }