Task operations become pure functions over arrays.
Ids move from Date.now() to crypto.randomUUID(), with a fallback for
non-secure contexts, since people do self-host this over plain HTTP on a
LAN.
Undo gets its own module so tasks.js stays pure. It covers single deletes
and clear-completed batches, and clamps indices because the list can
change between recording an entry and undoing it.
Aculix Technologies