v0.1.3

Notes are the headline. A thought about a card — this back conflates two rules,
this front gives the answer away — now has somewhere to go, and it goes beside
the deck rather than under XDG_DATA_HOME, so it travels with the cards through
git or syncthing where a review schedule deliberately does not.

• n in a session opens a composer on the card in front of you. A practice pass
  can write one; nothing is scheduled by a remark.
• leitner note <ref> [text] files one from the shell, lists a card's notes with
  the text left off, and drops one with --rm. leitner notes prints the whole
  collection's and stats counts them.
• Every card has a readable reference now, shortenable while it stays
  unambiguous, and leitner list prints them.
• An edit through e that renames a card carries its notes across. A note
  arriving at an occupied reference is kept, not dropped — two schedules cannot
  merge, but two remarks about what is now one card are both still true.

Also in this release:

• p practises a whole deck outside the schedule, from the picker or the
  completion screen. It writes no review state.
• . hides a deck from the picker and reveals the hidden ones again;
  hiddenDecks in the config is what it toggles.
• Finishing a deck returns you to the picker instead of ending the session.
• editor in the config names the editor e opens, ahead of $EDITOR.

Under the hood: the deck format follows Flashcard Markdown to 1.1, which is a
clarification release — the conformance corpus passes unchanged, and nothing
about what leitner parses has moved. The toolchain moves to vitest 5 and
oxlint 1.81.