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/discover/+page.svelte

@@ -1,4 +1,5 @@
 <script lang="ts">
+  import { pageTitle } from '$lib/branding';
   import { createLidarrSearchQuery } from '$lib/api/lidarr';
   import { createRequest } from '$lib/api/requests';
   import DiscoverResultCard from '$lib/components/DiscoverResultCard.svelte';
@@ -115,6 +116,8 @@
   ];
 </script>
 
+<svelte:head><title>{pageTitle('Discover')}</title></svelte:head>
+
 <!--
   Page layout: a full-height flex column so the persistent chrome
   (DiscoverTabs, search input, facet tabs) stays anchored at the top