feat(ai): add ADR-036 unified OCR architecture and frontend test coverage

- Add ADR-036 unified OCR architecture (typhoon-ocr via Ollama)
- Extend AI execution profiles for OCR sandbox configuration
- Add comprehensive frontend test coverage (components, hooks, services)
- Add backend test coverage for document-numbering services
- Update OCR sidecar with typhoon-ocr integration
- Add AI policy service and execution profile management
- Update AGENTS.md and architecture documentation

frontend/lib/stores/__tests__/project-store.test.ts

@@ -0,0 +1,56 @@
+// File: frontend/lib/stores/__tests__/project-store.test.ts
+// Change Log:
+// - 2026-06-13: Initial creation - test coverage for useProjectStore (Zustand)
+
+import { describe, it, expect, beforeEach } from 'vitest';
+import { act, renderHook } from '@testing-library/react';
+import { useProjectStore } from '../project-store';
+
+describe('useProjectStore', () => {
+  beforeEach(() => {
+    // รีเซ็ต store ก่อนแต่ละ test
+    act(() => {
+      useProjectStore.setState({ selectedProjectId: null });
+    });
+  });
+
+  it('ค่า default ควรเป็น selectedProjectId: null', () => {
+    const { result } = renderHook(() => useProjectStore());
+    expect(result.current.selectedProjectId).toBeNull();
+  });
+
+  it('setSelectedProjectId ควรตั้งค่า selectedProjectId ด้วย UUIDv7 ที่กำหนด', () => {
+    const { result } = renderHook(() => useProjectStore());
+    const projectId = '019505a1-7c3e-7000-8000-abc123def456';
+    act(() => {
+      result.current.setSelectedProjectId(projectId);
+    });
+    expect(result.current.selectedProjectId).toBe(projectId);
+  });
+
+  it('setSelectedProjectId ควรเปลี่ยน selectedProjectId จาก UUID เป็น null ได้', () => {
+    const projectId = '019505a1-7c3e-7000-8000-abc123def456';
+    act(() => {
+      useProjectStore.setState({ selectedProjectId: projectId });
+    });
+    const { result } = renderHook(() => useProjectStore());
+    act(() => {
+      result.current.setSelectedProjectId(null);
+    });
+    expect(result.current.selectedProjectId).toBeNull();
+  });
+
+  it('setSelectedProjectId ควรเปลี่ยน project ได้หลายครั้ง', () => {
+    const { result } = renderHook(() => useProjectStore());
+    const projectId1 = '019505a1-7c3e-7000-8000-abc123def001';
+    const projectId2 = '019505a1-7c3e-7000-8000-abc123def002';
+    act(() => {
+      result.current.setSelectedProjectId(projectId1);
+    });
+    expect(result.current.selectedProjectId).toBe(projectId1);
+    act(() => {
+      result.current.setSelectedProjectId(projectId2);
+    });
+    expect(result.current.selectedProjectId).toBe(projectId2);
+  });
+});