A generic, format-agnostic drag-and-drop + click-to-browse upload zone for non-image files (PDF/CSV/JSON/vector exports). Validates each file with a bundled validateFile helper (copy-owned — no @localmode dependency) against an accept MIME list and maxSize, emitting only valid files via onUpload; rejected files go to onReject. Disabled/processing overlay blocks input. Distinct from media-vision's MediaDropzone (no image-preview semantics).