Convert multiple pages into SPA

svelte/src/layout/Dialog.svelte

@@ -22,6 +22,10 @@ export const open = (button_rect: DOMRect) => {
 	dialog.style.top = Math.round(Math.min(min_top, max_top)) + "px"
 }
 
+export const close = () => {
+	dialog.close()
+}
+
 // Attach a click handler so that the dialog is closed when the user clicks
 // outside the dialog. The way this check works is that there is usually an
 // element inside the dialog with all the content. When the click target is