v0.7.0 — Camera entity, interactive radar map, robust motion tracking

Highlights

• Radar camera entity (camera.radarbild) — a rendered local radar crop with a motion-direction arrow, color-coded by intensity.
• Interactive Leaflet radar map — dark basemap + DWD WMS overlay (same-origin proxy, no API key) with a geo-scaled motion arrow projecting the rain field up to 6 h, with hour ticks and arrival timestamps. Scales with zoom.
• Fullscreen map view — tap the "Radarkarte" heading to open the map full-screen for better overview.
• Robust motion tracking — multi-pair TREC estimation with parabolic sub-pixel refinement, search-boundary railing rejection, outlier filtering, and temporal EMA smoothing. The arrow no longer jitters between updates.

Fixed

• Alarm fatigue: rain_imminent no longer fires on trace radar echoes. The "raining" threshold is now 0.1 mm/h (WMO measurable precipitation) and the imminent alert requires a forecasted peak of >= 0.3 mm/h within 30 min.
• WMS proxy 502 when DWD returns a Content-Type with a charset parameter.

Full changelog: https://github.com/nodomain/ha-rain-warner/blob/main/CHANGELOG.md