The splash PNG already has the title and version baked in by
generate-splash.py, but SplashScreen::splashImage() was drawing them
again at position (6,75) which fell outside the rounded background
rectangle (starts at 30,30). Skip runtime text rendering for Kindred
Create while keeping the dev build warning.
Also switch the splash background from Catppuccin Mocha base (#1e1e2e)
to mantle (#181825) for a darker appearance and regenerate assets.