feat: add initial project setup with core PDF tools and utilities

- Implement core PDF manipulation tools (split, merge, convert, etc.)
- Add state management and UI utilities
- Set up build configuration with Vite and TailwindCSS
- Include essential dependencies for PDF processing
- Add gitignore and basic project configuration files

src/js/logic/redact.ts

@@ -0,0 +1,41 @@
+import { showLoader, hideLoader, showAlert } from '../ui.js';
+import { downloadFile } from '../utils/helpers.js';
+import { state } from '../state.js';
+
+// @ts-expect-error TS(2339) FIXME: Property 'PDFLib' does not exist on type 'Window &... Remove this comment to see the full error message
+const { rgb } = window.PDFLib;
+
+export async function redact(redactions: any, canvasScale: any) {
+    showLoader('Applying redactions...');
+    try {
+        const pdfPages = state.pdfDoc.getPages();
+        const conversionScale = 1 / canvasScale;
+
+        redactions.forEach((r: any) => {
+            const page = pdfPages[r.pageIndex];
+            const { height: pageHeight } = page.getSize();
+
+            // Convert canvas coordinates back to PDF coordinates
+            const pdfX = r.canvasX * conversionScale;
+            const pdfWidth = r.canvasWidth * conversionScale;
+            const pdfHeight = r.canvasHeight * conversionScale;
+            const pdfY = pageHeight - (r.canvasY * conversionScale) - pdfHeight;
+
+            page.drawRectangle({
+                x: pdfX,
+                y: pdfY,
+                width: pdfWidth,
+                height: pdfHeight,
+                color: rgb(0, 0, 0),
+            });
+        });
+
+        const redactedBytes = await state.pdfDoc.save();
+        downloadFile(new Blob([redactedBytes], { type: 'application/pdf' }), 'redacted.pdf');
+    } catch (e) {
+        console.error(e);
+        showAlert('Error', 'Failed to apply redactions.');
+    } finally {
+        hideLoader();
+    }
+}