Widget quick-add: surface errors instead of failing silently

addTask()'s failure path had no .onFailure handler, so a failed POST
(network hiccup, server down) left the Add sheet just sitting there
with zero feedback -- looked like the button did nothing.

Also: the five calls chained after a successful addTask (updateTask,
reschedule, setTaskProject, setTaskLabels, setTaskRecurrence) were
still unchecked, so a task could get created with silently-dropped
metadata even with the addTask fix in place. Both paths now collect
and toast what failed; the task itself still gets created and the
sheet still closes, since aborting would leave a task that already
exists server-side with no way to tell the user without a duplicate.

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