Add Activepieces integration for workflow automation

- Add Activepieces fork with SmoothSchedule custom piece
- Create integrations app with Activepieces service layer
- Add embed token endpoint for iframe integration
- Create Automations page with embedded workflow builder
- Add sidebar visibility fix for embed mode
- Add list inactive customers endpoint to Public API
- Include SmoothSchedule triggers: event created/updated/cancelled
- Include SmoothSchedule actions: create/update/cancel events, list resources/services/customers

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

activepieces-fork/packages/react-ui/src/components/ui/loading-screen.tsx

@@ -0,0 +1,27 @@
+import { cn } from '../../lib/utils';
+
+import { LoadingSpinner } from './spinner';
+
+type LoadingScreenProps = {
+  brightSpinner?: boolean;
+  mode?: 'fullscreen' | 'container';
+};
+export const LoadingScreen = ({
+  brightSpinner = false,
+  mode = 'fullscreen',
+}: LoadingScreenProps) => {
+  return (
+    <div
+      className={cn('flex h-screen w-screen items-center justify-center', {
+        'h-full w-full': mode === 'container',
+      })}
+    >
+      <LoadingSpinner
+        className={cn({
+          'stroke-background!': brightSpinner,
+        })}
+        isLarge={true}
+      ></LoadingSpinner>
+    </div>
+  );
+};