#1418 Add regression tests for missed automatically taken reminders

[fpMiguel]

Summary

Regression tests for #1418 ("Battery dead = missing medications"). When the phone is
off at the time an automatically taken dose is due, that dose should still be recorded
as taken. The behavior already exists on main (fix e657feb2, December 2025, which
predates the issue). This PR adds tests so it cannot break unnoticed.

No production code changes.

Changes

• MissedAutomaticallyTakenReminderTest (JVM / Robolectric, new): three scenarios.
  A missed automatically taken reminder is caught up and recorded as TAKEN. A missed
  reminder without that flag is raised instead. A reminder that fires right on time
  behaves correctly. This is the first JVM test for the catch-up path; nothing on main
  covered it before.
• MissedAutomaticallyTakenInstrumentedTest (instrumented, new): the scenario from
  the issue, end to end on a device. An automatically taken reminder with a past time is
  caught up and shown as taken in the overview, and no "taken" action stays in the
  notification shade. This complements NotificationTest.automaticallyTakenTest, which
  fires at a future time.
• TestReminderContext fake fix: the create() stub returned a Long where the
  repository interface declares ReminderEvent. Any test using that path crashed. No
  existing test hit it; the new one did.

Testing

• JVM: MissedAutomaticallyTakenReminderTest, 3/3 green. Also verified from a clean
  checkout of main with the fake fix applied.
• Instrumented (Android 16 emulator, API 36): the new test passes 1/1, and the existing
  NotificationTest.automaticallyTakenTest passes 1/1 on the same code.
• Test data is synthetic ("Test med").

AI was used to create this pull request

[Futsch1]

This does not nail the actual issue and code path which is taken when the device is off. In this case, a special routine is triggered that is called when the Android device is restarted. This cannot be tested via AndroidTest, since it would have to reboot the device (or I am not aware about how to do it). The test you added is no regression test for the referenced issue.

[Futsch1]

I think most of the cases tested here are already covered by other tests. I am sorry, but I do not see additional value in this test...