refactor: track lengths and file sizes come from the shared formatters on Missing files, Duplicates, a want's Releases and the app download; an hour-long track reads 1:01:05, not 61:05 (M505 #5639 #5640)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/src/lib/components/MobileAppDownload.svelte

@@ -2,6 +2,7 @@
   import { onMount } from 'svelte';
   import { Download, Smartphone } from 'lucide-svelte';
   import { api } from '#lib/api/client.js';
+  import { formatBytes } from '#lib/utils/bytes.js';
   import SettingsGroup from '#lib/components/settings/SettingsGroup.svelte';
   import SettingRow from '#lib/components/settings/SettingRow.svelte';
 
@@ -20,11 +21,6 @@
 
   let info = $state<Info | null>(null);
 
-  function formatSize(bytes: number): string {
-    if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(0)} KB`;
-    return `${(bytes / 1024 / 1024).toFixed(1)} MB`;
-  }
-
   onMount(async () => {
     try {
       const body = await api.get<Partial<WireInfo>>('/api/client/version');
@@ -44,7 +40,7 @@
   <SettingsGroup title="Android app">
     <SettingRow
       label="Minstrel for Android"
-      hint="{info.version}{info.sizeBytes > 0 ? ` · ${formatSize(info.sizeBytes)}` : ''} · sign in with this account"
+      hint="{info.version}{info.sizeBytes > 0 ? ` · ${formatBytes(info.sizeBytes)}` : ''} · sign in with this account"
     >
       <Smartphone size={18} strokeWidth={1.5} class="text-text-secondary" aria-hidden="true" />
       <a