refactor: address loading review findings (#18)

frontend/src/app/components/tenant-card/tenant-card.spec.ts

@@ -41,6 +41,23 @@ describe('TenantCard', () => {
     expect(fixture.nativeElement.textContent).toContain('Envoi : 50 %');
   });
 
+  it('falls back to indeterminate upload feedback when no total is available', () => {
+    const fixture = TestBed.createComponent(TenantCard);
+    fixture.componentRef.setInput('tenant', {
+      id: 'tenant-1',
+      firstName: 'Camille',
+      lastName: 'Martin',
+      email: 'camille@example.com',
+      phone: '',
+      address: '',
+    });
+    fixture.componentRef.setInput('uploading', true);
+    fixture.detectChanges();
+
+    expect(fixture.nativeElement.textContent).toContain('Envoi…');
+    expect(fixture.nativeElement.querySelector('mat-progress-bar')).not.toBeNull();
+  });
+
   it('shows progress only on the selected attachment download', () => {
     const fixture = TestBed.createComponent(TenantCard);
     fixture.componentRef.setInput('tenant', {