Feature/v2/navigate save prompt (#4586)

# Description of Changes

<!--
Please provide a summary of the changes, including:

- What was changed
- Why the change was made
- Any challenges encountered

Closes #(issue_number)
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---

## Checklist

### General

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] 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)
- [ ] I have performed a self-review of my own code
- [ ] 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)

### 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)

- [ ] 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.

frontend/src/services/enhancedPDFProcessingService.ts

@@ -200,11 +200,13 @@ export class EnhancedPDFProcessingService {
         const page = await pdf.getPage(i);
         const thumbnail = await this.renderPageThumbnail(page, config.thumbnailQuality);
 
+        const rotation = page.rotate || 0;
+
         pages.push({
           id: `${createQuickKey(file)}-page-${i}`,
           pageNumber: i,
           thumbnail,
-          rotation: 0,
+          rotation,
           selected: false
         });
 
@@ -254,7 +256,7 @@ export class EnhancedPDFProcessingService {
         id: `${createQuickKey(file)}-page-${i}`,
         pageNumber: i,
         thumbnail,
-        rotation: 0,
+        rotation: page.rotate || 0,
         selected: false
       });
 
@@ -265,11 +267,15 @@ export class EnhancedPDFProcessingService {
 
     // Create placeholder pages for remaining pages
     for (let i = priorityCount + 1; i <= totalPages; i++) {
+      // Load page just to get rotation
+      const page = await pdf.getPage(i);
+      const rotation = page.rotate || 0;
+
       pages.push({
         id: `${createQuickKey(file)}-page-${i}`,
         pageNumber: i,
         thumbnail: null, // Will be loaded lazily
-        rotation: 0,
+        rotation,
         selected: false
       });
     }
@@ -316,7 +322,7 @@ export class EnhancedPDFProcessingService {
         id: `${createQuickKey(file)}-page-${i}`,
         pageNumber: i,
         thumbnail,
-        rotation: 0,
+        rotation: page.rotate || 0,
         selected: false
       });
 
@@ -333,11 +339,15 @@ export class EnhancedPDFProcessingService {
 
     // Create placeholders for remaining pages
     for (let i = firstChunkEnd + 1; i <= totalPages; i++) {
+      // Load page just to get rotation
+      const page = await pdf.getPage(i);
+      const rotation = page.rotate || 0;
+
       pages.push({
         id: `${createQuickKey(file)}-page-${i}`,
         pageNumber: i,
         thumbnail: null,
-        rotation: 0,
+        rotation,
         selected: false
       });
     }
@@ -367,11 +377,15 @@ export class EnhancedPDFProcessingService {
     // Create placeholder pages without thumbnails
     const pages: PDFPage[] = [];
     for (let i = 1; i <= totalPages; i++) {
+      // Load page just to get rotation
+      const page = await pdf.getPage(i);
+      const rotation = page.rotate || 0;
+
       pages.push({
         id: `${createQuickKey(file)}-page-${i}`,
         pageNumber: i,
         thumbnail: null,
-        rotation: 0,
+        rotation,
         selected: false
       });
     }
@@ -390,7 +404,7 @@ export class EnhancedPDFProcessingService {
     const scales = { low: 0.2, medium: 0.5, high: 0.8 }; // Reduced low quality for page editor
     const scale = scales[quality];
 
-    const viewport = page.getViewport({ scale });
+    const viewport = page.getViewport({ scale, rotation: 0 });
     const canvas = document.createElement('canvas');
     canvas.width = viewport.width;
     canvas.height = viewport.height;