refactor(web/m7-363): Shell header reads appName() not literal

web/src/lib/components/Shell.svelte

@@ -4,6 +4,7 @@
   import { ChevronDown } from 'lucide-svelte';
   import { user, logout } from '$lib/auth/store.svelte';
   import { player } from '$lib/player/store.svelte';
+  import { appName } from '$lib/branding';
   import PlayerBar from './PlayerBar.svelte';
   import SearchInput from './SearchInput.svelte';
 
@@ -57,7 +58,7 @@
 
 <div class="grid h-screen grid-cols-[auto_1fr] grid-rows-[auto_1fr_auto] bg-background text-text-primary">
   <header class="col-span-2 flex items-center gap-4 border-b border-border bg-surface px-4 py-3">
-    <div class="font-semibold">Minstrel</div>
+    <div class="font-semibold">{appName()}</div>
     <div class="flex-1">
       <SearchInput />
     </div>