Clean up the notification handling code and fix a lot of bugs, hopefully
without introducing new ones in the process.
Specific bugs discovered and fixed:
- The code that tried to sync notification filtering state between the
server and Pachli could fail, leaving things in an inconsistent state,
resulting in dropped notifications. Remove that code, do filtering
client-side.
- Logging out of an account would disable push notifications for all
accounts.
- If any account did not support push notifications then push
notifications were disabled for all accounts.
- If any account did not support push notifications the user was
prompted to log out of all accounts. Drop that entirely.
- The UnifiedPush library could get to a state where configuring the
notification mechanism would silently fail,
The preferences UI now has a section for notifications, showing:
- The Unified Push distributor in use (if any)
- A mechanism to change the distributor
- Per-account configuration and notification fetch details
- Battery optimisation state
General changes:
- Update to UnifiedPush library 2.4.0.
- NotificationFetcher.fetchAndShow() can now fetch a single account's
notifications, or all accounts, depending on data passed to the worker.
- Use ApiResult for `push/subscription` responses.
- Drop the "needs migration" terminology for the more specific "has push
scope", to make it clear what the issue with the account is.
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