feat(rental): add inventory and condition reports (#7)

frontend/src/app/components/private-area-editor/private-area-editor.spec.ts

@@ -0,0 +1,20 @@
+import { TestBed } from '@angular/core/testing';
+import { vi } from 'vitest';
+import { PrivateAreaEditor } from './private-area-editor';
+
+describe('PrivateAreaEditor', () => {
+  it('adds a stable private area and derives the main-room count from its family', () => {
+    const fixture = TestBed.createComponent(PrivateAreaEditor);
+    fixture.componentRef.setInput('areas', []);
+    const changed = vi.fn();
+    fixture.componentInstance.areasChanged.subscribe(changed);
+
+    fixture.componentInstance.addArea();
+
+    expect(changed).toHaveBeenCalledWith([
+      expect.objectContaining({ family: 'PIECE_PRINCIPALE', subtype: 'OTHER' }),
+    ]);
+    fixture.componentRef.setInput('areas', changed.mock.calls[0][0]);
+    expect(fixture.componentInstance.mainRoomCount()).toBe(1);
+  });
+});