feat(storm-intel): search, pin-drop radius, more event types

Search: text filter across areaName/type/severity in sidebar

Pin drop (up to 5 pins):
- Crosshair button activates drop mode; next map click places a pin
- 5-mile radius circle drawn on map for each pin
- Sidebar shows only events within 5mi of any pin, sorted by distance
- Distance label (e.g. "1.2 mi") shown on each card
- Individual pin removal + clear all; + Add pin shortcut in pin strip
- Map shows blank + drop-prompt until at least one pin is placed

More event types:
- Hook now fetches WS/BZ/WW/IS (winter storm, blizzard, ice) from IEM
- SV without hailtag maps to wind; SV with hailtag maps to hail
- New icons: CloudHail, CloudSnow, CloudRain per type
- Type filter row added to filter bar: All/Hail/Tornado/Flood/Wind/Snow/Rain

src/hooks/useStormEvents.js

@@ -21,8 +21,8 @@ const WFO      = 'FWD'; // Fort Worth NWS office — covers Collin County / Plan
 // Plano / Collin County bounding box
 const BBOX = { minLat: 32.85, maxLat: 33.45, minLon: -97.15, maxLon: -96.35 };
 
-// Only keep storm-relevant phenomena
-const KEEP_PH = new Set(['SV', 'TO', 'FF']);
+// Storm-relevant NWS phenomena codes
+const KEEP_PH = new Set(['SV', 'TO', 'FF', 'WS', 'BZ', 'WW', 'IS']);
 
 function extractRing(geom) {
     if (!geom) return null;
@@ -70,7 +70,12 @@ function featureToEvent(feature, idx) {
 
     const polygon = rawCoords.map(([lon, lat]) => [lat, lon]); // → Leaflet [lat,lon]
 
-    const type = ph === 'TO' ? 'tornado' : ph === 'FF' ? 'flood' : 'hail';
+    const type = ph === 'TO'                        ? 'tornado'
+               : ph === 'FF'                        ? 'flood'
+               : ph === 'WS' || ph === 'BZ'         ? 'snow'
+               : ph === 'WW' || ph === 'IS'         ? 'ice'
+               : hailIn !== null                    ? 'hail'
+               : 'wind';
 
     const hailIn = p.hailtag ? parseFloat(p.hailtag) : null;
     const severity = ph === 'TO'    ? 'severe'