feat: add comprehensive loading feedback (#18)

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

@@ -21,4 +21,44 @@ describe('TenantCard', () => {
 
     expect(fixture.componentInstance.uploadError()).toContain('250 Mo');
   });
+
+  it('shows measurable progress and disables only its upload control', () => {
+    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.componentRef.setInput('uploadProgress', 50);
+    fixture.detectChanges();
+
+    expect(fixture.nativeElement.querySelector('input[type=file]').disabled).toBe(true);
+    expect(fixture.nativeElement.querySelector('mat-progress-bar')).not.toBeNull();
+    expect(fixture.nativeElement.textContent).toContain('Envoi : 50 %');
+  });
+
+  it('shows progress only on the selected attachment download', () => {
+    const fixture = TestBed.createComponent(TenantCard);
+    fixture.componentRef.setInput('tenant', {
+      id: 'tenant-1',
+      firstName: 'Camille',
+      lastName: 'Martin',
+      email: 'camille@example.com',
+      phone: '',
+      address: '',
+      attachments: [
+        { id: 'attachment-1', fileName: 'id.pdf', contentType: 'application/pdf', size: 42 },
+      ],
+    });
+    fixture.componentRef.setInput('downloadingAttachmentIds', new Set(['attachment-1']));
+    fixture.detectChanges();
+
+    const download = fixture.nativeElement.querySelector('.attachment-row');
+    expect(download.disabled).toBe(true);
+    expect(download.textContent).toContain('Téléchargement…');
+  });
 });