test(03-01): add Wave 0 RED baseline stubs for all 7 requirements

- src/App.test.tsx: WIZD-02 step routing (3 stubs)
- src/components/wizard/BackendSelectionStep.test.tsx: WIZD-01, WIZD-04 (10 stubs)
- src/components/wizard/RemoteConfigStep.test.tsx: BACK-01, BACK-02, BACK-03 (8 stubs)
- src/components/wizard/StepIndicator.test.tsx: WIZD-03 (5 stubs)
- All 26 tests fail RED with descriptive 'not yet implemented' messages

src/components/wizard/RemoteConfigStep.test.tsx

@@ -0,0 +1,45 @@
+// @vitest-environment jsdom
+// Covers BACK-01: Azure Blob config form — account + SAS/Key toggle, both values preserved
+// Covers BACK-02: Amazon S3 config form — access_key_id, secret_access_key, region
+// Covers BACK-03: S3-Compatible config form — same as S3 plus endpoint field
+import { describe, it, expect } from 'vitest';
+
+describe('RemoteConfigStep', () => {
+  describe('BACK-01: Azure Blob form', () => {
+    it('renders Storage Account Name field', () => {
+      expect.fail('not yet implemented');
+    });
+
+    it('shows SAS URL field by default (default auth method)', () => {
+      expect.fail('not yet implemented');
+    });
+
+    it('switching auth toggle to Access Key shows key field and hides SAS URL', () => {
+      expect.fail('not yet implemented');
+    });
+
+    it('switching auth toggle does not clear the hidden field value', () => {
+      expect.fail('not yet implemented');
+    });
+  });
+
+  describe('BACK-02: Amazon S3 form', () => {
+    it('renders access_key_id field', () => {
+      expect.fail('not yet implemented');
+    });
+
+    it('renders secret_access_key field', () => {
+      expect.fail('not yet implemented');
+    });
+
+    it('renders region field', () => {
+      expect.fail('not yet implemented');
+    });
+  });
+
+  describe('BACK-03: S3-Compatible form', () => {
+    it('renders endpoint field in addition to S3 fields', () => {
+      expect.fail('not yet implemented');
+    });
+  });
+});