19f2414f42
Direct file download from the public share landing carries rights / abuse risk. Replace the Download button with the Open-in-app deep link in both the logged-in flow (now: Add to library + Open in app) and the anonymous flow (now: Open in app + Get Readest footnote). The /api/share/[token]/download route is left intact so re-enabling the button later is a one-file UI change.