feat(web/m7-363): per-route svelte:head titles for static routes

Add browser tab titles to all 18 static page routes using the pageTitle()
helper from $lib/branding. Titles follow the Minstrel · Section format.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

web/src/routes/search/artists/+page.svelte

@@ -1,4 +1,5 @@
 <script lang="ts">
+  import { pageTitle } from '$lib/branding';
   import { page } from '$app/state';
   import { createSearchArtistsInfiniteQuery } from '$lib/api/queries';
   import ArtistCard from '$lib/components/ArtistCard.svelte';
@@ -15,6 +16,8 @@
   const showSkeleton = useDelayed(() => !!query?.isPending);
 </script>
 
+<svelte:head><title>{pageTitle('Search · Artists')}</title></svelte:head>
+
 <div class="space-y-4">
   <header>
     <a href={`/search?q=${encodeURIComponent(q)}`} class="text-sm text-text-secondary hover:text-text-primary">