fix(ag-ui): advanced markers ignore clicks — set gmpClickable (#749)

Regression from the AdvancedMarkerElement migration: the legacy
google.maps.Marker was clickable by default, but AdvancedMarkerElement is
NOT — without gmpClickable it never fires click/gmp-click, so the wrapper's
(mapClick) output stays silent and the marker info window (focus + Remove)
never opens. Pass { gmpClickable: true } via the marker [options].

Found by Brian during live review; verified live in Chrome — markers report
gmpClickable=true and clicking opens the info window. (The "use gmp-click"
console hint was this bug's symptom, not noise.)

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

Author: blove

examples/ag-ui/angular/src/app/map-canvas.component.ts

@@ -45,6 +45,7 @@ const PARIS_CENTER: google.maps.LatLngLiteral = { lat: 48.8566, lng: 2.3522 };
             [position]="m.position"
             [content]="m.content"
             [title]="m.stop.place"
+            [options]="advancedMarkerOptions"
             (mapClick)="onMarkerClick(m.stop)"
           />
         }
@@ -95,6 +96,12 @@ export class MapCanvasComponent {
     zoomControl: true,
     clickableIcons: false,
   };
+  // AdvancedMarkerElement is NOT clickable by default (unlike the legacy
+  // Marker) — without gmpClickable it never fires click/gmp-click, so the
+  // wrapper's (mapClick) output stays silent and the info window can't open.
+  protected readonly advancedMarkerOptions: google.maps.marker.AdvancedMarkerElementOptions = {
+    gmpClickable: true,
+  };
 
   private readonly googleMap = viewChild(GoogleMap);
   private readonly infoWindow = viewChild(MapInfoWindow);