Fix: actually show HD image for nearby streetview imager, add loading indicator

src/UI/Image/ImagePreview.svelte

@@ -4,10 +4,12 @@
    */
   import panzoom from "panzoom"
   import type { ProvidedImage } from "../../Logic/ImageProviders/ImageProvider"
+  import { UIEventSource } from "../../Logic/UIEventSource"
 
   export let image: ProvidedImage
   let panzoomInstance = undefined
   let panzoomEl: HTMLElement
+  export let isLoaded: UIEventSource<boolean> = undefined
 
   $: {
     if (panzoomEl) {
@@ -16,7 +18,7 @@
         boundsPadding: 0.49,
         minZoom: 1,
         maxZoom: 25,
-        initialZoom: 1.2,
+        initialZoom: 1.0,
       })
     } else {
       panzoomInstance?.dispose()
@@ -24,4 +26,5 @@
   }
 </script>
 
-<img bind:this={panzoomEl} src={image.url_hd ?? image.url} class="panzoom-image h-fit w-fit" />
+<img bind:this={panzoomEl} class="panzoom-image h-fit w-fit" on:load={() => {isLoaded?.setData(true)}}
+     src={image.url_hd ?? image.url} />