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

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

@@ -0,0 +1,79 @@
+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 CropNode extends BaseWorkflowNode {
+  readonly category = 'Edit & Annotate' as const;
+  readonly icon = 'ph-crop';
+  readonly description = 'Trim margins from all pages';
+
+  constructor() {
+    super('Crop');
+    this.addInput('pdf', new ClassicPreset.Input(pdfSocket, 'PDF'));
+    this.addOutput('pdf', new ClassicPreset.Output(pdfSocket, 'Cropped PDF'));
+    this.addControl(
+      'top',
+      new ClassicPreset.InputControl('number', { initial: 0 })
+    );
+    this.addControl(
+      'bottom',
+      new ClassicPreset.InputControl('number', { initial: 0 })
+    );
+    this.addControl(
+      'left',
+      new ClassicPreset.InputControl('number', { initial: 0 })
+    );
+    this.addControl(
+      'right',
+      new ClassicPreset.InputControl('number', { initial: 0 })
+    );
+  }
+
+  async data(
+    inputs: Record<string, SocketData[]>
+  ): Promise<Record<string, SocketData>> {
+    const pdfInputs = requirePdfInput(inputs, 'Crop');
+
+    const getNum = (key: string) => {
+      const ctrl = this.controls[key] as
+        | ClassicPreset.InputControl<'number'>
+        | undefined;
+      return Math.max(0, ctrl?.value ?? 0);
+    };
+
+    const top = getNum('top');
+    const bottom = getNum('bottom');
+    const left = getNum('left');
+    const right = getNum('right');
+
+    return {
+      pdf: await processBatch(pdfInputs, async (input) => {
+        const pdfDoc = await PDFDocument.load(input.bytes);
+        const pages = pdfDoc.getPages();
+
+        for (const page of pages) {
+          const { width, height } = page.getSize();
+          const cropWidth = width - left - right;
+          const cropHeight = height - top - bottom;
+          if (cropWidth <= 0 || cropHeight <= 0) {
+            throw new Error(
+              'Crop margins exceed page dimensions. Reduce crop values.'
+            );
+          }
+          page.setCropBox(left, bottom, cropWidth, cropHeight);
+        }
+
+        const pdfBytes = await pdfDoc.save();
+        return {
+          type: 'pdf',
+          document: pdfDoc,
+          bytes: new Uint8Array(pdfBytes),
+          filename: input.filename.replace(/\.pdf$/i, '_cropped.pdf'),
+        };
+      }),
+    };
+  }
+}