feat: create PageLoader spinner component

apps/react/src/app/components/page-loader/index.ts

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+export { PageLoader } from './page-loader'
+export type { PageLoaderProps } from './page-loader'

apps/react/src/app/components/page-loader/page-loader.scss

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+.page-loader {
+  position: fixed;
+  top: 0;
+  left: 0;
+  right: 0;
+  bottom: 0;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  background: rgba(255, 255, 255, 0.8);
+  z-index: 1000;
+}
+
+.page-loader__content {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 20px;
+  padding: 40px;
+  background: white;
+  border-radius: 8px;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
+}
+
+.page-loader__message {
+  font-size: 16px;
+  color: #666;
+  margin: 0;
+}
+
+.page-loader__cancel {
+  margin-top: 10px;
+}

apps/react/src/app/components/page-loader/page-loader.tsx

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+import React from 'react'
+import { ProgressSpinner } from 'primereact/progressspinner'
+import { Button } from 'primereact/button'
+import { useTranslation } from 'react-i18next'
+import './page-loader.scss'
+
+export interface PageLoaderProps {
+  isLoading: boolean
+  onCancel?: () => void
+  message?: string
+}
+
+export const PageLoader: React.FC<PageLoaderProps> = ({ isLoading, onCancel, message }) => {
+  const { t } = useTranslation()
+
+  if (!isLoading) {
+    return null
+  }
+
+  return (
+    <div className="page-loader" data-testid="page-loader">
+      <div className="page-loader__content">
+        <ProgressSpinner
+          style={{ width: '50px', height: '50px' }}
+          strokeWidth="4"
+          fill="var(--surface-ground)"
+          animationDuration=".5s"
+        />
+        {message && <p className="page-loader__message">{message}</p>}
+        {onCancel && (
+          <Button
+            label={t('SHARED.CANCEL')}
+            severity="secondary"
+            onClick={onCancel}
+            data-testid="page-loader-cancel"
+            className="page-loader__cancel"
+          />
+        )}
+      </div>
+    </div>
+  )
+}