feat:(pdfa-conversion) Implement Strict PDF/A Mode with Verification (#5663)

# Description of Changes


This PR introduces a new "Strict Mode" for the PDF to PDF/A conversion
tool. When enabled, the application will use VeraPDF to verify that the
resulting file is perfectly compliant with the selected PDF/A standard.
If validation fails, the system will return a descriptive error instead
of a non-compliant file.



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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)

### 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)

- [ ] 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/hooks/tools/automate/useSuggestedAutomations.ts

@@ -48,7 +48,8 @@ export function useSuggestedAutomations(): SuggestedAutomation[] {
               fromExtension: 'pdf',
               toExtension: 'pdfa',
               pdfaOptions: {
-                outputFormat: 'pdfa-1',
+                outputFormat: 'pdfa-2b',
+                strict: false,
               }
             }
           },

frontend/src/core/hooks/tools/convert/useConvertOperation.ts

@@ -79,6 +79,7 @@ export const buildConvertFormData = (parameters: ConvertParameters, selectedFile
     formData.append("includeAllRecipients", emailOptions.includeAllRecipients.toString());
   } else if (fromExtension === 'pdf' && toExtension === 'pdfa') {
     formData.append("outputFormat", pdfaOptions.outputFormat);
+    formData.append("strict", String(!!pdfaOptions.strict));
   } else if (fromExtension === 'pdf' && toExtension === 'pdfx') {
     // Use PDF/A endpoint with PDF/X format parameter
     formData.append("outputFormat", pdfxOptions?.outputFormat || 'pdfx');

frontend/src/core/hooks/tools/convert/useConvertParameters.test.ts

@@ -24,7 +24,7 @@ describe('useConvertParameters', () => {
       expect(result.current.parameters.emailOptions.maxAttachmentSizeMB).toBe(10);
       expect(result.current.parameters.emailOptions.downloadHtml).toBe(false);
       expect(result.current.parameters.emailOptions.includeAllRecipients).toBe(false);
-      expect(result.current.parameters.pdfaOptions.outputFormat).toBe('pdfa-1');
+      expect(result.current.parameters.pdfaOptions.outputFormat).toBe('pdfa-2b');
     });
 
     test('should update individual parameters', () => {
@@ -95,7 +95,8 @@ describe('useConvertParameters', () => {
 
       act(() => {
         result.current.updateParameter('pdfaOptions', {
-          outputFormat: 'pdfa'
+          outputFormat: 'pdfa',
+          strict: false
         });
       });
 

frontend/src/core/hooks/tools/convert/useConvertParameters.ts

@@ -35,6 +35,7 @@ export interface ConvertParameters extends BaseParameters {
   };
   pdfaOptions: {
     outputFormat: string;
+    strict?: boolean;
   };
   pdfxOptions: {
     outputFormat: string;
@@ -93,7 +94,8 @@ export const defaultParameters: ConvertParameters = {
     includeAllRecipients: false,
   },
   pdfaOptions: {
-    outputFormat: 'pdfa-1',
+    outputFormat: 'pdfa-2b',
+    strict: false,
   },
   pdfxOptions: {
     outputFormat: 'pdfx',