Right-click → "Copy Link Address" / "Open in New Tab" / "Save Link
As" now work natively, so users can share the conversion URL or pick
their own download path. The buttons are styled <a href> elements
instead of <button>, with the `download` attribute set to the
expected filename (foo.docx etc.) so a plain click still downloads.
Click handler simplifies a lot: on clean buffer, the handler returns
immediately and the browser handles the navigation. On dirty buffer,
the handler intercepts, auto-saves, then re-fires the click — which
re-enters the handler with dirty=false and falls through to the
native navigation. No more JS fetch + blob + objectURL plumbing for
the common path.
Side effect: if the server returns 422 or 503, the browser shows the
response body in the target tab. That's less polished than the
previous toast, but it's also a more direct view of what the server
actually said. The toast path stays in shared/zddc-source.js's
downloadConverted helper for tools that prefer the JS-driven flow.
ZDDC
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