feat(v9): Hermes-Chat full-bleed, landet direkt auf /chat

Schlanke Kopfleiste (nur Cockpit/Setup), iframe fuellt das Fenster
(calc(100dvh - 116px)) und oeffnet die Chat-Route des Dashboards direkt.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/panels/HermesPanel.svelte

@@ -59,13 +59,10 @@
   })
 </script>
 
-<!-- ==================== HEADER ==================== -->
-<div class="pagehead" style="display:flex;justify-content:space-between;align-items:flex-start">
-  <div>
-    <h1>Hermes</h1>
-    <div class="sub">Dein lokaler KI-Assistent — kennt den Bosgame, lernt mit.</div>
-  </div>
-  <div class="flex gap-2" style="flex-shrink:0;margin-top:6px;flex-wrap:wrap;align-items:center">
+<!-- ==================== HEADER (schlank, fuer Full-Bleed-Chat) ==================== -->
+<div class="pagehead" style="display:flex;justify-content:space-between;align-items:center;margin-bottom:10px">
+  <h1 style="margin:0;font-size:20px">Hermes</h1>
+  <div class="flex gap-2" style="flex-shrink:0;flex-wrap:wrap;align-items:center">
     <!-- Hermes-Status -->
     <span class="chip" style="font-size:11px;{status?.hermes === 'ready'
       ? 'color:#7ee29a;border-color:rgba(126,226,154,.4)'
@@ -284,13 +281,13 @@
   </div>
 {/if}
 
-<!-- ==================== CHAT (eingebettetes Hermes-Web-Dashboard) ==================== -->
-<div class="card" style="padding:0;overflow:hidden">
+<!-- ==================== CHAT (eingebettetes Hermes-Web-Dashboard, full-bleed) ==================== -->
+<div class="card" style="padding:0;overflow:hidden;border-radius:12px">
   {#if status?.hermes === 'ready'}
     <iframe
       title="Hermes Chat"
-      src="/hermes-ui/"
-      style="width:100%;height:calc(100vh - 210px);min-height:540px;border:0;display:block;background:#0f1720"
+      src="/hermes-ui/chat"
+      style="width:100%;height:calc(100dvh - 116px);min-height:520px;border:0;display:block;background:#0f1720"
     ></iframe>
   {:else}
     <div class="empty-c" style="padding:48px 24px">