jcoffey-dev
984f0474e3
Files could only hand you the bytes: double-clicking a picture put it on disk and left you to find it. The viewer for this already existed -- images, PDFs and text, in the attachment preview in MessageView -- it was just wired to one screen. It is now a component both screens use. Two things it needed before it was any use on Files. The type detection falls back to the file name: an upload carries whatever the browser guessed, which for anything unusual is application/octet-stream, so the old exact-type check saw nothing to show in a .md that had just been uploaded. And text is read with fetch, which ignores Content-Disposition, so Markdown previews even though the server will not serve it inline. Whether we can show a file and whether the server will serve it inline are separate questions, and lib/preview.ts answers them separately: `openableInTab` mirrors the isInlineSafe allowlist in the blob route, because navigating to a blob the server will not inline just starts a download. SVG is left out of both -- it carries script, and how to show one safely is its own question, not a detail of a file lister. Printing goes with it. A picture or a text file prints from the dialog with everything else dropped; a PDF prints itself from its own iframe, since the page around it cannot paginate someone else's document. Hiding `.app` alone was not enough there -- `#root` kept its height and printed a blank first page, the same trap as the message card.