feat(redaction): update to embedPDF v2.4.0 with unified redaction mode support (#5652)

# Description of Changes


Bump to EmbedPDF v2.4.0 plus update to the redaction methods


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- Why the change was made
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## Checklist

### General

- [X] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [X] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md)
(if applicable)
- [X] I have performed a self-review of my own code
- [X] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### Translations (if applicable)

- [ ] I ran
[`scripts/counter_translation.py`](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/docs/counter_translation.md)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [X] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md#6-testing)
for more details.

---------

Signed-off-by: Balázs Szücs <[email protected]>

frontend/src/core/components/viewer/RedactionAPIBridge.tsx

@@ -3,6 +3,11 @@ import { useRedaction as useEmbedPdfRedaction } from '@embedpdf/plugin-redaction
 import { useRedaction } from '@app/contexts/RedactionContext';
 import { useActiveDocumentId } from '@app/components/viewer/useActiveDocumentId';
 
+/**
+ * RedactionAPIBridge - Uses embedPDF v2.5.0
+ * Bridges between the EmbedPDF redaction plugin and the Stirling-PDF RedactionContext.
+ * Uses the unified redaction mode (toggleRedact/enableRedact/endRedact).
+ */
 export function RedactionAPIBridge() {
   const activeDocumentId = useActiveDocumentId();
   
@@ -43,13 +48,22 @@ function RedactionAPIBridgeInner({ documentId }: { documentId: string }) {
   }, [state?.pendingCount, state?.activeType, state?.isRedacting, setPendingCount, setActiveType, setIsRedacting]);
 
   // Expose the EmbedPDF API through our context's ref
+  // Uses v2.5.0 unified redaction mode
   useImperativeHandle(redactionApiRef, () => ({
-    toggleRedactSelection: () => {
-      provides?.toggleRedactSelection();
+    // Unified redaction methods (v2.5.0)
+    toggleRedact: () => {
+      provides?.toggleRedact();
     },
-    toggleMarqueeRedact: () => {
-      provides?.toggleMarqueeRedact();
+    enableRedact: () => {
+      provides?.enableRedact();
     },
+    isRedactActive: () => {
+      return provides?.isRedactActive() ?? false;
+    },
+    endRedact: () => {
+      provides?.endRedact();
+    },
+    // Common methods
     commitAllPending: () => {
       provides?.commitAllPending();
       // Don't set redactionsApplied here - it should only be set after the file is saved