feat(storm-intel): Phase 4+5 — Tomorrow.io forecast overlay and canvasser zone assignment

- Tomorrow.io 7-day forecast strip with weather icons, storm score bar, and per-day risk color coding
- High-risk alert banner in forecast strip when any day scores >=65
- api/storm-forecast.js: Vercel proxy that reads TOMORROW_API_KEY server-side; graceful empty response when key unset
- useStormForecast hook: USE_MOCK=false with realistic MOCK_FORECAST fallback
- ZoneDrawingLayer: click-to-place polygon vertices using react-leaflet useMapEvents; disables double-click zoom while active; shows live vertex dots + dashed preview polygon
- ZoneLayer: renders stormZones as colored semi-transparent polygons with agent initials at centroid
- ZoneAssignmentModal: name + canvasser picker + color selector + optional storm link; portaled modal
- StormIntelPage: Draw Zone button (Admin/Owner only); drawing state/cancel flow; stormZones displayed on map; zone summary strip in sidebar; StormDetailDrawer has working "Draw Canvasser Zone" action
- FieldStormZonePage: canvasser mobile view at /field/storm-zones showing assigned zones with map, linked storm details, conversion window badge, and peak window alert
- Layout: Storm Zones entry in FIELD_AGENT nav
- App: /field/storm-zones route (FIELD_AGENT + Admin + Owner)

src/App.jsx

@@ -37,6 +37,7 @@ import EstimatesPage from './pages/EstimatesPage';
 import KanbanPage from './pages/KanbanPage';
 import LeadProjectPage from './pages/LeadProjectPage';
 import StormIntelPage from './pages/StormIntelPage';
+import FieldStormZonePage from './pages/FieldStormZonePage';
 
 // ... (existing imports)
 const ProtectedRoute = ({ children, allowedRoles }) => {
@@ -279,6 +280,14 @@ function App() {
                 </ProtectedRoute>
               }
             />
+            <Route
+              path="/field/storm-zones"
+              element={
+                <ProtectedRoute allowedRoles={['FIELD_AGENT', 'ADMIN', 'OWNER']}>
+                  <FieldStormZonePage />
+                </ProtectedRoute>
+              }
+            />
             <Route
               path="/admin/maps"
               element={