v0.6.1 — Robust notification card templates

v0.6.1 — Robust notification card templates

Fixed

• The walldisplay notification cards now read values from the
  triggering binary sensor's own attributes rather than from
  separate sensor entities. The integration writes the alert flag and
  its supporting attributes in the same coordinator pass, so the card
  never has to handle a half-populated state. Also fixes the
  empty-card render that happened when manually overriding the alert
  state for testing.
• Templates fall back gracefully ("Regen ab gleich" / "Glatteis-Risiko"
  without temperature) when an attribute is unexpectedly missing,
  rather than blowing up silently.

How to test

In Developer Tools → States, set
binary_sensor.rain_warner_rain_imminent to on with attributes:

rain_starts_in_minutes: 18
rain_starts_at: "2026-06-04T21:38:00+00:00"

The notification card should appear within a second showing
"🟦 🌧️ Regen ab 23:38 (in 18 min)".