Store previous page for photo Viewer close button

src/routes/__layout.svelte

@@ -2,7 +2,7 @@
     import '../style/style.scss'
     import { navigating, page } from '$app/stores'
     import { onMount, setContext } from 'svelte'
-    import { pageLoading } from '$utils/stores'
+    import { pageLoading, previousPage } from '$utils/stores'
     import { scrollToTop } from '$utils/functions'
     import { DURATION } from '$utils/contants'
     import '$utils/polyfills'
@@ -24,6 +24,14 @@
     /**
      * On page change
      */
+    // Store previous page (for photo Viewer close button)
+    let previous = ''
+    page.subscribe(value => {
+        $previousPage = previous
+        previous = value.path
+    })
+
+    // Define page loading from navigating store
     navigating.subscribe((store: any) => {
         if (store) {
             $pageLoading = true