Upload feature (c): atomic UI components (atoms/molecules/organisms) + stories

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/shared/ui/upload/upload-status-banner/upload-status-banner.component.ts

@@ -0,0 +1,23 @@
+import { Component, computed, input } from '@angular/core';
+import { AlertComponent } from '@shared/ui/alert/alert.component';
+
+type BannerType = 'info' | 'warning' | 'error';
+type AlertType = 'info' | 'ok' | 'warning' | 'error';
+
+/** Molecule: a polite, announced status banner. Wraps the alert atom and maps the
+    banner type to an alert type. Pure UI: the container computes the message. */
+@Component({
+  selector: 'app-upload-status-banner',
+  imports: [AlertComponent],
+  template: `
+    <div aria-live="polite">
+      <app-alert [type]="alertType()">{{ message() }}</app-alert>
+    </div>
+  `,
+})
+export class UploadStatusBannerComponent {
+  message = input.required<string>();
+  type = input<BannerType>('info');
+
+  protected readonly alertType = computed<AlertType>(() => (this.type() === 'info' ? 'info' : this.type()));
+}