Add visual workflow builder, fix critical bugs, and add Arabic i18n support

src/js/workflow/nodes/flatten-node.ts

@@ -0,0 +1,45 @@
+import { ClassicPreset } from 'rete';
+import { BaseWorkflowNode } from './base-node';
+import { pdfSocket } from '../sockets';
+import type { SocketData } from '../types';
+import { requirePdfInput, processBatch } from '../types';
+import { PDFDocument } from 'pdf-lib';
+
+export class FlattenNode extends BaseWorkflowNode {
+  readonly category = 'Secure PDF' as const;
+  readonly icon = 'ph-stack';
+  readonly description = 'Flatten forms and annotations';
+
+  constructor() {
+    super('Flatten');
+    this.addInput('pdf', new ClassicPreset.Input(pdfSocket, 'PDF'));
+    this.addOutput('pdf', new ClassicPreset.Output(pdfSocket, 'Flattened PDF'));
+  }
+
+  async data(
+    inputs: Record<string, SocketData[]>
+  ): Promise<Record<string, SocketData>> {
+    const pdfInputs = requirePdfInput(inputs, 'Flatten');
+
+    return {
+      pdf: await processBatch(pdfInputs, async (input) => {
+        const pdfDoc = await PDFDocument.load(input.bytes);
+
+        try {
+          const form = pdfDoc.getForm();
+          form.flatten();
+        } catch (err) {
+          console.error('Flatten form error (may have no forms):', err);
+        }
+
+        const pdfBytes = await pdfDoc.save();
+        return {
+          type: 'pdf',
+          document: pdfDoc,
+          bytes: new Uint8Array(pdfBytes),
+          filename: input.filename.replace(/\.pdf$/i, '_flattened.pdf'),
+        };
+      }),
+    };
+  }
+}