guard around potential crashes

src/routes/streams/[stream_id]/Player.svelte

@@ -16,6 +16,7 @@
     import { onMount, untrack } from 'svelte';
     import { fade } from 'svelte/transition';
     import { getStreamContext } from '$lib/streamContext.svelte.ts';
+    import { readStored, writeStored } from '$lib/utils.ts';
     import type { Track } from '$lib/types';
 
     const ctx = getStreamContext();
@@ -87,8 +88,7 @@
         isSafari = isIOS || isDesktopSafari;
 
         // default volume
-        const volumeData = localStorage.getItem('volume');
-        volume = volumeData ? parseFloat(volumeData) : 0.67;
+        volume = readStored('volume', 0.67);
         setVolume(volume);
 
         // set actions for previous/next track media buttons
@@ -181,7 +181,7 @@
         if (!volumeBar) return;
         volume = seek(event, volumeBar.getBoundingClientRect());
         setVolume(volume);
-        localStorage.setItem('volume', volume.toString());
+        writeStored('volume', volume);
         muted = false;
     }