Fix error propagation in handleUpload function

[coderabbitai]

Description

The handleUpload function in next-ts/src/lib/common/helper-methods.ts (lines 49-84) currently swallows errors in its catch block, preventing callers from detecting upload failures. This causes the FileUpload component to show a "done" state even when uploads fail.

Location

• File: next-ts/src/lib/common/helper-methods.ts
• Lines: 49-84
• Function: handleUpload

Problem

The catch block on line 80 logs the error and shows a toast message but never re-throws, causing callers like FileUpload/index.tsx to treat failed uploads as successful.

Proposed Solution

Update the catch block to propagate the failure by either:

1. Re-throwing the caught error (throw error;)
2. Returning Upload.LIST_IGNORE on error

Keep the existing logging and toast notifications but ensure the error is not swallowed.

Example Fix

} catch (error) {
  console.error(error);
  message.error("Upload failed");
  throw error; // Add this line
}

Context

• Related PR: Feature/application First Step E2E #39
• Comment: Feature/application First Step E2E #39 (comment)
• Priority: Pre-release 1 cleanup
• Requested by: @blebelo