fix: merge main, address code review feedback for security fix PR #816

- Merge origin/main into branch (resolve conflict in integrations_dashboard.html)
- Add defensive JSON parsing with try/except for integration.config
- Wrap tester() call in try/except to prevent 500 errors from bad config
- Add i18n key integrations.connection_test_failed_fallback in en.json
- Reference i18n key in template JS fallback message
- Update SECURITY_AUDIT.md: add fix date (2026-03-23), update doc date
- Remove accidental revert.sh file
- Fix missing MagicMock/patch imports in test file
- Add tests for invalid JSON config and tester exception error paths

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>
Agent-Logs-Url: https://github.com/christianlouis/DocuElevate/sessions/daebb70e-059a-4601-8864-88eef49f99cf

frontend/static/js/upload.js

@@ -433,9 +433,17 @@ function _uploadSingleFile(file, progressBar, statusEl, onTerminal) {
       if (xhr.status === 200) {
         const result = JSON.parse(xhr.responseText);
         progressBar.style.width = '100%';
-        progressBar.className = 'file-progress-bar bg-green-500 h-2 rounded-full';
-        statusEl.textContent = `Success: Task ID: ${result.task_id}`;
-        statusEl.className = 'text-xs text-green-600 mt-1';
+
+        if (result.status === 'duplicate' && result.duplicate_of) {
+          // Exact duplicate – no processing task was created
+          progressBar.className = 'file-progress-bar bg-yellow-400 h-2 rounded-full';
+          statusEl.textContent = `Duplicate – already processed (file #${result.duplicate_of.original_file_id})`;
+          statusEl.className = 'text-xs text-yellow-600 mt-1';
+        } else {
+          progressBar.className = 'file-progress-bar bg-green-500 h-2 rounded-full';
+          statusEl.textContent = `Success: Task ID: ${result.task_id}`;
+          statusEl.className = 'text-xs text-green-600 mt-1';
+        }
         _onUploadSuccess();
         onTerminal();
         resolve({ rateLimited: false, retryAfterSeconds: 0 });