## Description
This fixes some issues restoring the app state after it is killed by the
system, such as to free up memory while the screensaver is showing.
### Dev notes
Reproduce:
1. Start playing media from beginning
2. Pause at 10 minute mark
3. Wait for screensaver to start
4. Press a button
5. Media starts from beginning
Note: It may take a few iterations of 2-4 before the OS destroys the
app.
If the app is killed during playback, ideally Wholphin restores state to
_previous_ page, not playback since restoring playback is complex.
Before this PR, the back stack was maintained by Compose's
`rememberSerializable` and would be restored _after_ the
`PlaybackLifecycleObserver` cleans up the playback destination.
This meant that the app would be restored, from scratch, to the playback
page. The `PlaybackViewModel` would be initialized from scratch as it
was originally called, ie play from beginning.
The fix is to save and restore the back stack outside of Compose.
### Related issues
Fixes#767
### Testing
Emulator & nvidia shield
## Screenshots
N/A
## AI or LLM usage
None
## Description
This PR is mostly a proof-of-concept for setting up automated UI
testing. The tests use Roboelectric so they can run without an emulator.
There is also a sample instrumented test for running on emulators or
devices for future tests.
It adds two basic automated UI tests for adding a server. These are sort
integration tests because they use the actual implementations for the
view model and services like `ServerRepository` and `JellyfinServerDao`.
Also, moves the bulk of `MainActivity`'s compose code into a function
for future tests.
### Related issues
N/A
### Testing
Local testing
## Screenshots
N/A
## AI or LLM usage
None
Remembers changes in playback tracks across playbacks. So, if you change
the audio track, quit the app, and return to the same id, the app will
play the audio track previously chosen.
Additionally, this PR fixes a UI inconsistency when there are multiple
versions of a item. Previously sometimes the audio/subtitle tracks for
wrong version would be shown during playback.
