Enable scroll through time with mousewheel

frontend/src/App.svelte

@@ -18,9 +18,16 @@
 			scrollingTimeFrameStore.next();
 		}
 	}
+	function scroll(event: WheelEvent) {
+		if (event.deltaY < 0) {
+			scrollingTimeFrameStore.next();
+		} else {
+			scrollingTimeFrameStore.prev();
+		}
+	}
 </script>
 
-<svelte:window on:keydown={keyDown} />
+<svelte:window on:keydown={keyDown} on:wheel={scroll} />
 <Toaster theme="dark" expand visibleToasts={9} />
 <template>
 	<!-- <Header /> -->