Dela 0.4.2

Fixes found while testing on a phone:

• Android: the home screen widget stayed empty or showed "Loading..." forever. The app could not pass tasks to it, and the row layout used a view type widgets do not allow.
• Android: a reminder could be cancelled by the app at the moment it was due, so it never showed. The app no longer opens the system "Alarms & reminders" screen on its own; Settings has a button for exact reminder times instead.
• Android: reminders and the widget are cleared on sign out.
• Android: widget settings follow the dark theme and return to the home screen after "Done".
• Pop-up messages can be swiped away or closed with ×; they stay 2.5 s, or 4 s when they have a button.
• A screenshot can be pasted into a comment with Ctrl+V or dropped onto it.
• Phone: dragging a task makes it a subtask only after holding it over the middle of another task.
• Phone: the tab bar and the + button hide while the on-screen keyboard is open.
• The device list names the apps "Dela app" instead of the browser engine.
• Key rotation started by hand and by a member leaving no longer race each other; deleting the account no longer races with sign out.