fix(repair): suppress corrupted PDF error/warning banner on repair page (#4434)

# Description of Changes

Updated JS/HTML to ignore PDF corruption warning on repair-pdf html,
since if user is already there, it may be safely assumed that the user
is well-aware about said PDF corruption, and does not actually benefit
from the information

Closes:  #4432

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- Why the change was made
- Any challenges encountered

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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)

### 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 <bszucs1209@gmail.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

app/core/src/main/resources/static/js/DecryptFiles.js

@@ -128,11 +128,15 @@ export class DecryptFile {
                  (error.message && error.message.includes('Invalid PDF structure'))) {
         // Handle corrupted PDF files
         console.error('Corrupted PDF detected:', error);
+        if (window.stirlingPDF.currentPage !== 'repair') {
           this.showErrorBanner(
             `${window.stirlingPDF.pdfCorruptedMessage.replace('{0}', file.name)}`,
             error.stack || '',
             `${window.stirlingPDF.tryRepairMessage}`
           );
+        } else {
+          console.log('Suppressing corrupted PDF warning banner on repair page');
+        }
         throw new Error('PDF file is corrupted.');
       }
 

app/core/src/main/resources/static/js/downloader.js

@@ -249,10 +249,15 @@
                    (error.message && error.message.includes('Invalid PDF structure'))) {
           // Handle corrupted PDF files
           console.log(`Corrupted PDF detected: ${file.name}`, error);
+          if (window.stirlingPDF.currentPage !== 'repair') {
             showErrorBanner(
               `${window.stirlingPDF.pdfCorruptedMessage.replace('{0}', file.name)}`,
               `${window.stirlingPDF.tryRepairMessage}`
             );
+          } else {
+            // On repair page, suppress banner; user already knows and is repairing
+            console.log('Suppressing corrupted PDF banner on repair page');
+          }
           throw error;
         } else {
           console.log(`Error loading PDF: ${file.name}`, error);

app/core/src/main/resources/templates/fragments/common.html

@@ -380,6 +380,7 @@
         window.stirlingPDF.uploadLimitExceededPlural = /*[[#{uploadLimitExceededPlural}]]*/ 'are too large. Maximum allowed size is';
         window.stirlingPDF.pdfCorruptedMessage = /*[[#{error.pdfInvalid}]]*/ 'The PDF file "{0}" appears to be corrupted or has an invalid structure. Please try using the \'Repair PDF\' feature to fix the file before proceeding.';
         window.stirlingPDF.tryRepairMessage = /*[[#{error.tryRepair}]]*/ 'Try using the Repair PDF feature to fix corrupted files.';
+        window.stirlingPDF.currentPage = /*[[${currentPage}]]*/ '';
       })();
   </script>
   <script type="module" th:src="@{'/pdfjs-legacy/pdf.mjs'}"></script>