Added file upload UI

frontend/src/app/format-file-size-pipe.pipe.ts

@@ -0,0 +1,19 @@
+import { Pipe, PipeTransform } from '@angular/core';
+
+@Pipe({
+  name: 'formatFileSizePipe',
+  standalone: true
+})
+export class FormatFileSizePipePipe implements PipeTransform {
+
+  transform(value: number, ...args: unknown[]): string {
+    if (value === null || value === 0) return '0 Bytes';
+
+    const units = ['Bytes', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];
+    const index = Math.min(Math.floor(Math.log(value) / Math.log(1024)), units.length - 1);
+    const filesize = Number((value / Math.pow(1024, index)).toFixed(2));
+
+    return `${filesize.toLocaleString()} ${units[index]}`;
+  }
+
+}