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-progress-bar/upload-progress-bar.component.ts

@@ -0,0 +1,24 @@
+import { Component, input } from '@angular/core';
+
+/** Atom: native progress bar for an in-flight upload. Pure UI — the caller supplies
+    the percentage. */
+@Component({
+  selector: 'app-upload-progress-bar',
+  styles: [`
+    :host { display: flex; align-items: center; gap: var(--rhc-space-max-md); }
+    progress { flex: 1; height: var(--rhc-space-max-md); }
+    .pct { font-size: var(--rhc-text-font-size-sm); color: var(--rhc-color-foreground-subtle); min-width: 3ch; text-align: end; }
+  `],
+  template: `
+    <progress
+      max="100"
+      [value]="progressPct()"
+      [attr.aria-label]="progressLabel"></progress>
+    <span class="pct">{{ progressPct() }}%</span>
+  `,
+})
+export class UploadProgressBarComponent {
+  progressPct = input.required<number>();
+
+  protected readonly progressLabel = $localize`:@@upload.progress.label:Uploadvoortgang`;
+}