diff --git a/frontend/src/components/ProjectsLayout.accessibility.test.tsx b/frontend/src/components/ProjectsLayout.accessibility.test.tsx
new file mode 100644
index 000000000..9bb58aebe
--- /dev/null
+++ b/frontend/src/components/ProjectsLayout.accessibility.test.tsx
@@ -0,0 +1,134 @@
+/* @vitest-environment jsdom */
+import React, { act } from "react";
+import { createRoot, type Root } from "react-dom/client";
+import { afterEach, describe, expect, it, vi } from "vitest";
+
+const apiClientMock = vi.hoisted(() => ({
+  get: vi.fn(),
+  post: vi.fn(),
+  getServerSessionClaims: vi.fn(),
+}));
+
+vi.mock("@/lib/api-client", () => ({ apiClient: apiClientMock }));
+
+vi.mock("lucide-react", () => ({
+  CalendarDays: () => <svg aria-hidden="true" />,
+  CheckCircle2: () => <svg aria-hidden="true" />,
+  Clock: () => <svg aria-hidden="true" />,
+  FileText: () => <svg aria-hidden="true" />,
+  FolderOpen: () => <svg aria-hidden="true" />,
+  GitBranch: () => <svg aria-hidden="true" />,
+  ListChecks: () => <svg aria-hidden="true" />,
+  Network: () => <svg aria-hidden="true" />,
+  Search: () => <svg aria-hidden="true" />,
+  User: () => <svg aria-hidden="true" />,
+}));
+
+import { ProjectsLayout } from "./ProjectsLayout";
+
+const candidate = {
+  candidate_uid: "project_candidate:alpha",
+  project_uid: "project_candidate:alpha",
+  title: "Project: Alpha Checkout",
+  status_code: "needs_review",
+  score: 0.87,
+  object_count: 1,
+  requirement_count: 1,
+  issue_count: 0,
+  milestone_count: 0,
+  deliverable_count: 0,
+  participant_count: 0,
+  source_segment_count: 1,
+  representative_object_uids: [],
+  citation_bundle: [],
+  updated_at: "2026-08-03T00:00:00Z",
+};
+
+async function flushAsyncWork() {
+  await act(async () => {
+    await Promise.resolve();
+    await Promise.resolve();
+  });
+}
+
+describe("ProjectsLayout accessibility", () => {
+  let root: Root | null = null;
+  let container: HTMLDivElement | null = null;
+
+  afterEach(() => {
+    if (root) act(() => root?.unmount());
+    root = null;
+    container?.remove();
+    container = null;
+    vi.clearAllMocks();
+  });
+
+  it("announces candidate confirmation as busy while the request is pending", async () => {
+    let resolveConfirmation: ((value: typeof candidate) => void) | undefined;
+    const pendingConfirmation = new Promise<typeof candidate>((resolve) => {
+      resolveConfirmation = resolve;
+    });
+
+    apiClientMock.get.mockImplementation((path: string) => {
+      if (path === "/api/webdav/folders") return Promise.resolve([]);
+      if (path === "/api/tasks") return Promise.resolve([]);
+      if (path === "/api/projects/candidates") {
+        return Promise.resolve({ candidates: [candidate] });
+      }
+      if (path === "/api/projects/project_candidate%3Aalpha/traceability") {
+        return Promise.resolve({
+          project_uid: candidate.project_uid,
+          candidate,
+          objects: [],
+          edges: [],
+        });
+      }
+      return Promise.reject(new Error(`Unexpected GET path: ${path}`));
+    });
+    apiClientMock.getServerSessionClaims.mockResolvedValue({
+      userId: "alice",
+      organizationId: "org-acme",
+      workspaceId: "workspace-org-acme",
+    });
+    apiClientMock.post.mockReturnValue(pendingConfirmation);
+
+    container = document.createElement("div");
+    document.body.appendChild(container);
+    root = createRoot(container);
+
+    await act(async () => {
+      root?.render(<ProjectsLayout />);
+    });
+    await flushAsyncWork();
+    await flushAsyncWork();
+
+    const confirmButton = Array.from(container.querySelectorAll("button")).find(
+      (button) => button.textContent?.includes("프로젝트 후보 확정"),
+    );
+    expect(confirmButton).toBeDefined();
+    expect(confirmButton?.disabled).toBe(false);
+    expect(confirmButton?.getAttribute("aria-busy")).toBe("false");
+
+    await act(async () => {
+      confirmButton?.click();
+      await Promise.resolve();
+    });
+
+    expect(confirmButton?.disabled).toBe(true);
+    expect(confirmButton?.getAttribute("aria-busy")).toBe("true");
+    expect(confirmButton?.textContent).toContain("확정 저장 중");
+    expect(apiClientMock.post).toHaveBeenCalledWith(
+      "/api/projects/candidates/project_candidate%3Aalpha/confirm",
+      {},
+    );
+
+    await act(async () => {
+      resolveConfirmation?.({ ...candidate, status_code: "confirmed" });
+      await pendingConfirmation;
+    });
+
+    expect(confirmButton?.disabled).toBe(true);
+    expect(confirmButton?.getAttribute("aria-busy")).toBe("false");
+    expect(confirmButton?.textContent).toContain("프로젝트 후보 확정됨");
+  });
+});
\ No newline at end of file
diff --git a/frontend/src/components/ProjectsLayout.tsx b/frontend/src/components/ProjectsLayout.tsx
index 20f1f72ee..2f750ffd9 100644
--- a/frontend/src/components/ProjectsLayout.tsx
+++ b/frontend/src/components/ProjectsLayout.tsx
@@ -681,6 +681,7 @@ export function ProjectsLayout() {
                         type="button"
                         onClick={handleConfirmCandidate}
                         disabled={confirmSubmitting || candidateConfirmed}
+                        aria-busy={confirmSubmitting}
                         className="rounded-md bg-primary px-3 py-1.5 text-primary-foreground hover:bg-primary/90 disabled:cursor-not-allowed disabled:bg-secondary disabled:text-muted-foreground"
                       >
                         {candidateConfirmed ? '프로젝트 후보 확정됨' : confirmSubmitting ? '확정 저장 중' : '프로젝트 후보 확정'}