Fixed
- The document preview in the DMS link dialog is large enough to recognise a document by. At 40×40 it showed a grey smudge and the filename remained the only way to tell two documents apart; the tile is now page-shaped and cropped from the top, so the header of the page stays readable. Selecting it opens a full-size preview over the dialog, with "open in DMS" and "link" right there — Escape closes the preview first, not the whole dialog. Where no thumbnail exists (Papra, or a failed fetch), the tile falls back to the direct link into the DMS as before.