feat(map): restore point-detail panel across navigation

assets/js/propagation_map_hook.ts

@@ -862,6 +862,7 @@ export const PropagationMap: Record<string, unknown> & {
 
       // Remember click location for the center marker
       this.clickedLatLng = [e.latlng.lat, e.latlng.lng]
+      localStorage.setItem("propagationMap.clickedPoint", JSON.stringify(this.clickedLatLng))
 
       // Show a temporary marker while computing
       L.circleMarker(this.clickedLatLng, {
@@ -903,6 +904,35 @@ export const PropagationMap: Record<string, unknown> & {
     }
     this.lastDetail = null
 
+    // Restore a previously-clicked point across page navigation: replay the
+    // click side-effects so the user lands back on the same detail panel
+    // they had open, with fresh server-side factors + viewshed.
+    const storedPoint = localStorage.getItem("propagationMap.clickedPoint")
+    if (storedPoint) {
+      try {
+        const parsed = JSON.parse(storedPoint)
+        if (Array.isArray(parsed) && typeof parsed[0] === "number" && typeof parsed[1] === "number") {
+          const [lat, lon] = parsed as [number, number]
+          this.clickedLatLng = [lat, lon]
+          this.viewshedLoading = true
+          L.circleMarker([lat, lon], {
+            radius: 6, color: "#fff", weight: 2,
+            fillColor: "#888", fillOpacity: 0.8, interactive: false
+          }).addTo(this.rangeCircles)
+          this.pushEvent("compute_viewshed", { lat, lon })
+          const basic = this.lookupPoint(lat, lon)
+          if (basic && this.detailPanel) {
+            const merged = { ...basic, ...this.bandInfo, factors: null } as unknown as PointDetail
+            this.detailPanel.innerHTML = buildLoadingHTML(merged)
+            this.showDetailPanel()
+          }
+          this.pushEvent("point_detail", { lat, lon })
+        }
+      } catch {
+        localStorage.removeItem("propagationMap.clickedPoint")
+      }
+    }
+
     this.handleEvent("rain_scatter_update", ({ rain_scatter }: { lat: number; lon: number; rain_scatter: RainScatter }) => {
       if (!this.lastDetail || !this.detailPanel) return
       this.lastDetail.rain_scatter = rain_scatter
@@ -1080,6 +1110,7 @@ export const PropagationMap: Record<string, unknown> & {
     this.clickedLatLng = null
     this.reachPolygon = null
     this.lastDetail = null
+    localStorage.removeItem("propagationMap.clickedPoint")
   },
 
   // Redraws the propagation reach polygon around the currently-clicked