test(webapp): reset the archive stub flag in beforeEach

The failure case toggled a module-level flag and reset it inline, so any
early exit between the toggle and the reset would leave the stub in its
failure state for the rest of the file. Reset it in beforeEach instead,
matching dashboardAgentClientMetadata.test.ts and
metadataRouteReplicaLag.guard.test.ts.

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

apps/webapp/test/archiveBranchRedirect.test.ts

@@ -2,7 +2,7 @@
 // paginated or filtered branches list must land back on that exact page instead
 // of a bare branches path that resets the list to page 1.
 
-import { describe, expect, it, vi } from "vitest";
+import { beforeEach, describe, expect, it, vi } from "vitest";
 import { action } from "~/routes/resources.branches.archive";
 
 vi.mock("~/services/session.server", () => ({
@@ -37,6 +37,10 @@ async function archive(redirectPath: string) {
 }
 
 describe("archiving a branch returns to the page it was started from", () => {
+  beforeEach(() => {
+    archiveSucceeds.value = true;
+  });
+
   it("preserves the query string on success", async () => {
     const response = await archive(LIST_PATH);
 
@@ -45,8 +49,8 @@ describe("archiving a branch returns to the page it was started from", () => {
 
   it("preserves the query string on failure", async () => {
     archiveSucceeds.value = false;
+
     const response = await archive(LIST_PATH);
-    archiveSucceeds.value = true;
 
     expect(response.headers.get("Location")).toBe(LIST_PATH);
   });