feat: enhance attachment actions with Font Awesome icons and improve layout

frontend/src/app/components/tenant-card/tenant-card.html

@@ -48,9 +48,11 @@
             (click)="attachmentDownloadRequested.emit({ tenantId: tenant().id!, attachment })"
           >
             @if (downloadingAttachmentIds().has(attachment.id)) {
-              <mat-spinner diameter="16" aria-hidden="true" /> Téléchargement…
+              <mat-spinner diameter="16" aria-hidden="true" />
+              <span class="attachment-file-name">Téléchargement…</span>
             } @else {
-              <span aria-hidden="true">↧</span>{{ attachment.fileName }}
+              <fa-icon class="attachment-download-icon" [icon]="faDownload" aria-hidden="true" />
+              <span class="attachment-file-name">{{ attachment.fileName }}</span>
             }
           </button>
           <button