Add three home-screen shortcuts (Add measurement, Today, Medications)
deep-linking into the app, each tagged `source=shortcut`. Add a 192×192
maskable icon alongside the existing 512 so adaptive launchers mask the
right size instead of downscaling the 512 or clipping the un-masked 192
"any" icon on circular masks.
No screenshots: the repo ships no real screenshot assets and fabricating
them is worse than the richer-install-dialog gain.
