The store picker and the export screen were the two frontend surfaces
the own-store work left unbuilt, so both backends shipped unreachable.
Settings gains a Storage section holding them: a full-screen picker over
Own / an installed external provider (dimmed when none is present, named
after the provider's own app), and an export screen with a per-list tick
and the two SAF destinations, a folder or a single zip. The picker asks
for the provider's runtime permission before writing the mode, so a
denial leaves the readable store in place instead of dropping the user on
the gate; a refusal is reported with a route to app settings.
Making the mode switchable at runtime had two consequences:
- reminders are armed off whichever store was active when they were
scheduled, so a switch rebuilds the set. ReminderScheduler.sync() is
now serialised — it is a read-modify-write over ScheduledReminderStore,
and overlapping runs each wrote their own set as the whole truth
- the permission gate is the only screen an External user can reach once
their provider app stops answering, so it offers the way back to our
own store
ExportWriter no longer deletes a previous export before recreating it (a
failure in between lost both), lists the target directory once instead of
per document, and carries a typed ExportFailure so the screen can report
in the user's language rather than an exception message.
Jean-Luc Makiola
ec2e2eb59d