docs: notes drawer module spec and plan

A drawer tile and page for bash-notes: browse, write, edit and delete
notes in the page, sharing notes.sh's store so both tools work on the
same notes.

Git follows notes.sh's shape, pull before write, commit and push after,
with two departures the page needs: an unconfirmed Save leaves db.json
uncommitted (write and commit are two clicks here, one invocation there),
so the pulls carry --autostash, and lastpull is stamped after the pull
rather than before it, which notes.sh does and then ignores the failed
pull that follows.

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