refactor(storage): improve question answer synchronization and isolation

Refactor the question answer storage mechanism to support multiple pending
fields simultaneously and improve data isolation.

- Update `QuestionAnswersProvider` to process all dirty fields in a single
  payload instead of just the first one found.
- Ensure all processed dirty keys are cleared from the tracking set.
- Update `TestQuestionsFlow` props to allow null `draftStorageKey`.
- Add comprehensive unit tests for `user-scoped-storage` to ensure
  account isolation and correct key generation.
- Update `slider-page` mocks to include marriage config query keys.

src/components/Componentes/auth-data-boundary.test.tsx

@@ -0,0 +1,77 @@
+import { render, waitFor } from "@testing-library/react";
+import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
+import { describe, expect, it, vi, beforeEach } from "vitest";
+import AuthDataBoundary from "./auth-data-boundary";
+import { marriageQueryKeys } from "@/hooks/marriage/query-keys";
+import { HABIB_AUTH_TOKEN_CHANGED_EVENT } from "@/lib/auth-bridge";
+
+describe("AuthDataBoundary", () => {
+  let queryClient: QueryClient;
+
+  beforeEach(() => {
+    window.localStorage.clear();
+    queryClient = new QueryClient({
+      defaultOptions: {
+        queries: { retry: false },
+      },
+    });
+  });
+
+  it("purges user-specific caches on habib:auth-token-changed while preserving config", async () => {
+    // Populate query cache with user data + config
+    queryClient.setQueryData(marriageQueryKeys.profile(), { id: 100, can_edit_profile: true });
+    queryClient.setQueryData(marriageQueryKeys.formOverview("profile", "en"), { form_id: "profile", sections: [] });
+    queryClient.setQueryData(marriageQueryKeys.formSection("profile", "job", "en"), { form_id: "profile", section: { id: "job" } });
+    queryClient.setQueryData(marriageQueryKeys.cattellQuestions("en"), { questions: [] });
+    queryClient.setQueryData(marriageQueryKeys.glasserQuestions("en"), { questions: [] });
+    queryClient.setQueryData(marriageQueryKeys.config(), { min_age: 18 });
+
+    render(
+      <QueryClientProvider client={queryClient}>
+        <AuthDataBoundary>
+          <div data-testid="child">Child Content</div>
+        </AuthDataBoundary>
+      </QueryClientProvider>,
+    );
+
+    // Verify initial cached data is present
+    expect(queryClient.getQueryData(marriageQueryKeys.profile())).toBeDefined();
+    expect(queryClient.getQueryData(marriageQueryKeys.formOverview("profile", "en"))).toBeDefined();
+    expect(queryClient.getQueryData(marriageQueryKeys.formSection("profile", "job", "en"))).toBeDefined();
+    expect(queryClient.getQueryData(marriageQueryKeys.cattellQuestions("en"))).toBeDefined();
+    expect(queryClient.getQueryData(marriageQueryKeys.config())).toBeDefined();
+
+    // Fire auth identity change (e.g. Account A logs out or switches to Account B)
+    window.dispatchEvent(new CustomEvent(HABIB_AUTH_TOKEN_CHANGED_EVENT, { detail: { token: "new-token" } }));
+
+    // All user-owned queries should be removed from the cache
+    await waitFor(() => {
+      expect(queryClient.getQueryData(marriageQueryKeys.profile())).toBeUndefined();
+    });
+    expect(queryClient.getQueryData(marriageQueryKeys.formOverview("profile", "en"))).toBeUndefined();
+    expect(queryClient.getQueryData(marriageQueryKeys.formSection("profile", "job", "en"))).toBeUndefined();
+    expect(queryClient.getQueryData(marriageQueryKeys.cattellQuestions("en"))).toBeUndefined();
+    expect(queryClient.getQueryData(marriageQueryKeys.glasserQuestions("en"))).toBeUndefined();
+
+    // Config query MUST be preserved (public/global)
+    expect(queryClient.getQueryData(marriageQueryKeys.config())).toEqual({ min_age: 18 });
+  });
+
+  it("runs legacy V3 migration once on mount", async () => {
+    window.localStorage.setItem("marriage:sections:old_slug:answers:v2", JSON.stringify({ pending_sync: true }));
+    expect(window.localStorage.getItem("marriage:storage-migration:v3")).toBeNull();
+
+    render(
+      <QueryClientProvider client={queryClient}>
+        <AuthDataBoundary>
+          <div>Mounted</div>
+        </AuthDataBoundary>
+      </QueryClientProvider>,
+    );
+
+    await waitFor(() => {
+      expect(window.localStorage.getItem("marriage:storage-migration:v3")).toBe("done");
+    });
+    expect(window.localStorage.getItem("marriage:sections:old_slug:answers:v2")).toBeNull();
+  });
+});

src/components/Componentes/test-questions-flow.tsx

@@ -44,7 +44,7 @@ type StoredTestDraft = {
 };
 
 function getStoredDraft(
-  storageKey: string | undefined,
+  storageKey: string | null | undefined,
   totalQuestions: number,
 ) {
   if (!storageKey || typeof window === "undefined")