[Xyolyp]

Four additions, all declarative WFF - the watch face still ships no app code.

Screenshots

Mock-ups rendered from the watch face geometry (not device photographs).

What is new

Water tank as battery gauge (showWaterTank, on by default, switchable in the editor)
A sight glass on the truck whose water level follows BATTERY_PERCENT. The water rectangle is scaled around its lower edge, so the fill level is the charge level. Below 15 % both the remaining water and the empty volume turn red - an almost empty tank alone would be too small to notice.

Call-sign plate carrying the date (showCallSign, on by default, switchable in the editor)
A plate on the roof reading DD/MM in the style of a German fire-service call sign, without the "Florian" prefix for lack of space. It sits on the truck, so it turns with the hour hand and is upside down or sideways for part of the day - as requested, and as a plate on a real vehicle behaves.

Blue lights on notification - a fourth mode next to off / hourly / always, active while UNREAD_NOTIFICATION_COUNT > 0.

Day/night dial with a soft crossfade
The scene stays black (night) and a daylight layer fades in over it. The daylight factor is a single expression - two clamped ramps multiplied, dawn 06:00-07:00 and dusk 19:00-20:00 - and the driving lights use its inverse, so background and lights crossfade together. At night the head lamps, their beams and the tail lamps are lit. Derived from local time (SECONDS_IN_DAY), so no weather provider or extra permission is involved. Ambient mode keeps the pure black background and no lights.

Editor labels are English with German translations; all data sources and the ListConfiguration/BooleanConfiguration syntax were checked against the WFF reference.

Not verified

Nothing here has run on a real watch yet: the editor entries, the tank scaling and the text rendering of the plate need a look on the Pixel Watch after merge.