fix(gui): region picker render + click-to-draw

Bug A: Maps render blank on /setup/adapters for FIRMS and USGS
because Leaflet computed zero dimensions before container layout
settled. Fix: add setTimeout invalidateSize() after map creation.

Bug B: No click-to-draw functionality - only drag corners. Fix:
add L.Control.Draw for rectangle drawing with CREATED event handler
to replace existing rectangle.

Both fixes applied to:
- setup_adapters.html (wizard inline JS)
- _region_picker.html (standalone edit page)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/central/gui/templates/_region_picker.html

@@ -59,6 +59,10 @@
         maxZoom: 18
     }).addTo(map);
 
+    // Ensure map renders correctly even if container has not
+    // finished laying out at init time
+    setTimeout(function() { map.invalidateSize(); }, 100);
+
     // Create initial rectangle
     const bounds = L.latLngBounds(
         L.latLng(savedSouth, savedWest),
@@ -69,11 +73,34 @@
     map.fitBounds(bounds.pad(0.1));
 
     // Create editable rectangle
-    const rectangle = L.rectangle(bounds, {
+    let rectangle = L.rectangle(bounds, {
         color: '#3388ff',
         weight: 2,
         fillOpacity: 0.2
-    }).addTo(map);
+    });
+
+    // Set up Leaflet.draw for click-to-draw
+    const drawnItems = new L.FeatureGroup();
+    drawnItems.addLayer(rectangle);
+    map.addLayer(drawnItems);
+
+    const drawControl = new L.Control.Draw({
+        draw: {
+            rectangle: { shapeOptions: { color: '#3388ff', weight: 2,
+                                         fillOpacity: 0.2 } },
+            polyline: false,
+            polygon: false,
+            circle: false,
+            marker: false,
+            circlemarker: false
+        },
+        edit: {
+            featureGroup: drawnItems,
+            edit: false,
+            remove: false
+        }
+    });
+    map.addControl(drawControl);
 
     // Make rectangle editable
     rectangle.editing.enable();
@@ -96,13 +123,33 @@
     // Listen for rectangle edit events
     rectangle.on('edit', updateInputs);
 
+    // When user draws a new rectangle, replace the existing one
+    map.on(L.Draw.Event.CREATED, function(e) {
+        drawnItems.clearLayers();
+        rectangle = e.layer;
+        rectangle.setStyle({ color: '#3388ff', weight: 2,
+                             fillOpacity: 0.2 });
+        drawnItems.addLayer(rectangle);
+        rectangle.editing.enable();
+        rectangle.on('edit', updateInputs);
+        updateInputs();
+    });
+
     // Reset button
     document.getElementById('region-reset-btn').addEventListener('click', function() {
         const originalBounds = L.latLngBounds(
             L.latLng(savedSouth, savedWest),
             L.latLng(savedNorth, savedEast)
         );
-        rectangle.setBounds(originalBounds);
+        drawnItems.clearLayers();
+        rectangle = L.rectangle(originalBounds, {
+            color: '#3388ff',
+            weight: 2,
+            fillOpacity: 0.2
+        });
+        drawnItems.addLayer(rectangle);
+        rectangle.editing.enable();
+        rectangle.on('edit', updateInputs);
         updateInputs();
     });
 

src/central/gui/templates/setup_adapters.html

@@ -174,17 +174,44 @@ document.addEventListener('DOMContentLoaded', function() {
             maxZoom: 18
         }).addTo(map);
 
+        // Ensure map renders correctly even if container has not
+        // finished laying out at init time
+        setTimeout(function() { map.invalidateSize(); }, 100);
+
         const bounds = L.latLngBounds(
             L.latLng(savedSouth, savedWest),
             L.latLng(savedNorth, savedEast)
         );
         map.fitBounds(bounds.pad(0.1));
 
-        const rectangle = L.rectangle(bounds, {
+        let rectangle = L.rectangle(bounds, {
             color: '#3388ff',
             weight: 2,
             fillOpacity: 0.2
-        }).addTo(map);
+        });
+
+        // Set up Leaflet.draw for click-to-draw
+        const drawnItems = new L.FeatureGroup();
+        drawnItems.addLayer(rectangle);
+        map.addLayer(drawnItems);
+
+        const drawControl = new L.Control.Draw({
+            draw: {
+                rectangle: { shapeOptions: { color: '#3388ff', weight: 2,
+                                             fillOpacity: 0.2 } },
+                polyline: false,
+                polygon: false,
+                circle: false,
+                marker: false,
+                circlemarker: false
+            },
+            edit: {
+                featureGroup: drawnItems,
+                edit: false,
+                remove: false
+            }
+        });
+        map.addControl(drawControl);
 
         rectangle.editing.enable();
 
@@ -204,6 +231,18 @@ document.addEventListener('DOMContentLoaded', function() {
         rectangle.on('edit', updateInputs);
         updateInputs();
 
+        // When user draws a new rectangle, replace the existing one
+        map.on(L.Draw.Event.CREATED, function(e) {
+            drawnItems.clearLayers();
+            rectangle = e.layer;
+            rectangle.setStyle({ color: '#3388ff', weight: 2,
+                                 fillOpacity: 0.2 });
+            drawnItems.addLayer(rectangle);
+            rectangle.editing.enable();
+            rectangle.on('edit', updateInputs);
+            updateInputs();
+        });
+
         // Fix map size when details is opened
         const details = container.closest('details');
         if (details) {