This MR:
- Caps the maximum width of delegates and centers them
- Makes the search widget style match the app drawer search bar
- Adds section headers
- Uses rounded delegates
This merge request implements a more mobile optimized solution for popup notification.
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The current controls are:
- Swipe up to move the notification to the notification center.
- Swipe left/right to dismiss the notification entirely.
- If multiple popup notifications are grouped together, tap on the bottom area to view them in a expanded view.
What still needs to be done:
- ~~For notification without a default action, tapping on them should probably open up the associated app.~~ Note: I think I will add this in a separate merge request as it probably should be the case regardless if the notification is a popup
- ~~Swiping down on a notification currently does nothing. Maybe we should map this to a notification action?~~ Note: I have some ideas I will try later, though for now, I will leave this action blank
- ~~The expanded view of notifications should be able to be dismissed by swiping up/down on the top/bottom of the list.~~ Note: Added
- Investigate further into how to remove the current desktop popup notifications.
- ~~Code clean up.~~ Note: The code is at least a bit better
Single popup notification:

Multiple popup notifications:

Multiple popup notifications in the expanded view:

Any feedback would be greatly appreciated.
Adjusted the colors of the notifications and media controls to help them fit in better together.


Fixes an issue where if the media controls were active and the action drawer was flicked opened, sometimes it would not fully open.
Changes include:
1. Media controls will now no longer animate its height if `implicitHeight` is 0
2. The action drawer animation code was reworked to allow its height to change dynamically.
This (partially) reverts commit 127bbdf653.
Only incorrect changes from Kirigami.Units.largeSpacing to
Kirigami.Units.gridUnit are reverted. Only Plasma.Units were buggy.
This allows us in the future to use mobileshell without having the WindowUtil singleton loaded (which does a bunch of wayland calls that aren't necessary for most applications).
Having a global set margins and orientation (that were calculated from the panel containment) caused a lot of issues with the way bindings were evaluated across panels, and with high coupling.
Now use properties from within containments to determine shell margins instead, which removes the dependency on other containments for measurements. This allows us to get rid of TaskPanelControls as well!
Fixes: https://invent.kde.org/teams/plasma-mobile/issues/-/issues/198
Fixes an issue where the ListView was sometimes not tall enough to hold the content despite the list not overflowing.
Also adjusts button text to be smaller.