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/admin/+page.svelte

@@ -1,4 +1,5 @@
 <script lang="ts">
+  import { pageTitle } from '$lib/branding';
   import { Disc3, Album, Music2, Check, X, RotateCcw, Trash2, Cloud, ChevronRight } from 'lucide-svelte';
   import { useQueryClient } from '@tanstack/svelte-query';
   import {
@@ -177,6 +178,8 @@
   }
 </script>
 
+<svelte:head><title>{pageTitle('Admin · Overview')}</title></svelte:head>
+
 <div class="space-y-8">
   <header>
     <h2 class="font-display text-2xl font-medium text-text-primary">Overview</h2>

web/src/routes/admin/integrations/+page.svelte

@@ -1,4 +1,5 @@
 <script lang="ts">
+  import { pageTitle } from '$lib/branding';
   import { Save, RefreshCw, Trash2 } from 'lucide-svelte';
   import { useQueryClient } from '@tanstack/svelte-query';
   import {
@@ -162,6 +163,8 @@
   }
 </script>
 
+<svelte:head><title>{pageTitle('Admin · Integrations')}</title></svelte:head>
+
 <div class="space-y-6">
   <header class="flex items-center justify-between">
     <h2 class="font-display text-2xl font-medium text-text-primary">Integrations</h2>

web/src/routes/admin/quarantine/+page.svelte

@@ -1,4 +1,5 @@
 <script lang="ts">
+  import { pageTitle } from '$lib/branding';
   import { Music2, RotateCcw, Trash2, Cloud, Play, ChevronRight } from 'lucide-svelte';
   import { useQueryClient } from '@tanstack/svelte-query';
   import {
@@ -162,6 +163,8 @@
   );
 </script>
 
+<svelte:head><title>{pageTitle('Admin · Quarantine')}</title></svelte:head>
+
 <div class="space-y-6">
   <header class="space-y-1">
     <div class="flex items-center gap-2">

web/src/routes/admin/requests/+page.svelte

@@ -1,4 +1,5 @@
 <script lang="ts">
+  import { pageTitle } from '$lib/branding';
   import { Disc3, Album, Music2, Check, X, SlidersHorizontal } from 'lucide-svelte';
   import { useQueryClient } from '@tanstack/svelte-query';
   import {
@@ -170,6 +171,8 @@
   );
 </script>
 
+<svelte:head><title>{pageTitle('Admin · Requests')}</title></svelte:head>
+
 <div class="space-y-6">
   <header class="space-y-1">
     <h2 class="font-display text-2xl font-medium text-text-primary">Requests</h2>