The keyboard background now extends under the system bars and display
cutout on Android 15 but the keys do not.
The back and IME switching buttons that appear in the navigation bar require
special care to not overlap with the keyboard.
The launcher and settings activity are also fixed.
Replace the short video with an animated vector image that shows the
swipe gesture.
This is much lighter and reliable than the mp4 video, which failed to
play on many devices.
Source for the image of the key is in inkscape SVG format in srcs/res
and is converted to an android drawable when needed. The swipe animation
is hand-written.
This activity points to the system settings page for enabling input
methods. This is purely a shortcut but is expected by many users.
It could be made more useful in the future or hidden whenever the
keyboard is enabled.
