The new PWA icon matches the supplied reference: dark background, a
clock face with an orange upper-right arc and hands at 12 and 4
o'clock, sitting on an isometric cube whose two visible faces each
have the MEGA 'M' carved into the background colour, with two small
orange base wedges under the cube.
When the /clock URL is shared (Slack, iMessage, etc.) the static
1200x630 opengraph-image.png is picked up automatically and renders
the icon alongside the 'MEGA Clock' wordmark and tagline, via
openGraph + twitter metadata added to the route.
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