- New src/lib/api/moon.js: fetches daily moon_phase from Open-Meteo
(independent of the NWS/Open-Meteo weather source, since NWS has no moon
data), plus pure helpers: moonName (8 phases), illumination fraction, and
nextMoonPhase, which unwraps the ~29.5-day cycle and interpolates the next
quarter boundary (new/first quarter/full/last quarter), returning its name,
date, and days until it.
- New MoonPhaseCard.svelte: renders an SVG moon (two-circle terminator that
correctly shows crescent/quarter/gibbous shapes), the current phase name,
percent illuminated, and the next phase with date. Caches per-location via
an effect; degrades gracefully when unavailable.
- Wired into WeatherDetail between Sun and UV and Temperature Range.
- 11 unit tests for moonName/illumination/interpolation/nextMoonPhase.
- Verified in headless Chromium: card renders, moon shape correct, no errors.
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