Rain intensity gains a Severe tier and Dry becomes strictly no-rain:
- The top half of Very Heavy (95th–99th rain-day percentile) becomes a new
"Severe" tier; Very Heavy keeps the 90–95 band. Eight rain tiers now — Trace /
Light / Brisk / Typical / Heavy / Very Heavy / Severe / Extreme — which refill
the wet-2..wet-9 colour ramp contiguously (no gap), so Heavy/Very Heavy shift
one shade lighter and Severe takes the second-darkest.
- A day is Dry only when it didn't rain at all; any measurable rain, however
slight, is at least Trace. _grade_precip splits on > 0 rather than the 0.01"
threshold (which still governs the separate dry-streak metric).
- The distribution strip drops the range under the Dry column — every dry day is
zero, so a "0–0" span was noise.
_precip_ladder derives its percentile marks from RAIN_BANDS now, so adding or
splitting a tier can't leave a hard-coded list behind (that was the bug the 95th
mark would have hit). The detail-view ladder derives from the band table as before.
Claude-Session: https://claude.ai/code/session_013dRZmX9D3JEntfMKWMTWZ8
e105869363
