Claims, external sources, study mode, and the capture inbox

A large release. Highlights:

• CLAIMS with Supports/Refutes yarn, and a readout of what is attached to each one.
• EXTERNAL SOURCES — DOI, ISBN, arXiv, PubMed, web pages, and your own PDF uploads.
• LIVE SEARCH cards — a saved archive query that re-runs every time you open the board.
• CAPTURE INBOX — every reader highlight, plus a share-sheet target, a bookmarklet, and a browser extension.
• STUDY MODE — spaced repetition built from your own quotes and claims.
• READING VIEW for phones, and offline support for solo workspaces.
• ANALYZE, ARRANGE, and cross-board backlinks.
• RESIZABLE CARDS, a collapsing legend, and a group view when you zoom out.
• DELETED WORKSPACES can be reinstated for seven days.