Daniel Legt dbfdacc396 feat(download): support UTF-8 filenames in Content-Disposition ...

Improve the Content-Disposition header formatting for file downloads by implementing RFC 5987 compliant filename encoding. This ensures that downloaded files retain their original names, including spaces and non-ASCII characters, across different browsers.

- Add `contentDisposition` helper to generate both standard ASCII fallback and UTF-8 encoded filename parameters.
- Sanitize filenames to prevent path traversal and replace unsafe characters with underscores in the ASCII fallback.
- Update single file and ZIP downloads to use the new formatting.
- Add unit tests to verify correct header generation for various filename scenarios.

2026-06-08 10:53:20 +03:00

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