The Dock's pinned applications were a sixteen-entry literal in
Settings.qml, so changing what sits in the Dock meant editing QML. They
are now an ordered list in the shared store, with move up, move down,
unpin, and a filtered picker for adding installed applications. Keeping
them in the shared store rather than a file of their own means they are
covered by Restore defaults like everything else.
This needed a "json" schema type for values the schema stores and resets
but does not validate field by field. It exists so structured settings
can live in the one file rather than growing a fourth preference store;
the owning service validates the contents.
Snapshots make the settings app safe to experiment with. The whole
configuration is one file, so a backup is a copy and a restore is an
overwrite, and restoring snapshots what it replaces so it is itself
undoable. A snapshot is validated as JSON before it can be restored over
a working configuration, and a name that is not a plain snapshot
filename from the backup directory is refused.
Snapshot names carry milliseconds. At one-second resolution a save
followed promptly by a restore produced the same filename twice, and the
restore's own safety snapshot overwrote the file it was about to read --
found by the contract, which restores immediately after saving.
Claude-Session: https://claude.ai/code/session_01BRvzt4H8XXLPVH5MyYdk9L
