ui(wiki): Header wie die übrigen Sektionen (section-header), kein doppeltes 'Wiki'

- Übersicht: nur ein section-title (Rubrik 'Wiki' über Titel 'Wiki' entfernt)
- Einzelseite: Rubrik = Gruppe (z.B. Begriffe), Titel = Seitentitel
- Titel über die volle Breite (8px-Akzentlinie wie Library), Spalten darunter
- ungenutzte .wiki-rubric/.wiki-head CSS entfernt

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

assets/css/custom.css

@@ -738,8 +738,6 @@ a.byline-author:hover, a.journal-author:hover { color: var(--accent); }
 .wiki-nav li a.is-current { color: var(--color-text-primary); font-weight: 600; border-left-color: var(--accent); }
 
 .wiki-page { min-width: 0; }
-.wiki-rubric { text-transform: uppercase; letter-spacing: 0.1em; font-size: 0.72rem; color: var(--color-text-muted); margin: 0 0 0.2em; }
-.wiki-head h1 { margin: 0 0 0.2em; }
 .wiki-index { margin-top: var(--spacing-md); }
 .wiki-group { margin-bottom: var(--spacing-md); }
 .wiki-group h2 { font-family: var(--font-family-serif); font-size: 1.1rem; margin: 0 0 0.4em; }

layouts/wiki/list.html

@@ -1,13 +1,12 @@
 {{ define "main" }}
+  <header class="section-header">
+    <h1 class="section-title">{{ .Title }}</h1>
+  </header>
+
   <div class="wiki">
     <aside class="wiki-side">{{ partial "wiki-nav.html" . }}</aside>
 
-    <article class="wiki-page">
+    <div class="wiki-page">
-      <header class="wiki-head">
-        <p class="wiki-rubric">Wiki</p>
-        <h1>{{ .Title }}</h1>
-      </header>
-
       <div class="single-content">{{ .Content }}</div>
 
       {{ $pages := where site.RegularPages "Section" "wiki" }}
@@ -37,6 +36,6 @@
       {{ else }}
         <p class="text-muted"><em>Noch keine Einträge — der erste entsteht im Redaktions-Editor.</em></p>
       {{ end }}
-    </article>
+    </div>
   </div>
 {{ end }}

layouts/wiki/single.html

@@ -1,14 +1,14 @@
 {{ define "main" }}
+  <header class="section-header">
+    <p class="section-rubric">{{ with .Params.group }}{{ . }}{{ else }}Wiki{{ end }}</p>
+    <h1 class="section-title">{{ .Title }}</h1>
+    {{ with .Params.summary }}<p class="section-description">{{ . }}</p>{{ end }}
+  </header>
+
   <div class="wiki">
     <aside class="wiki-side">{{ partial "wiki-nav.html" . }}</aside>
 
-    <article class="wiki-page">
+    <div class="wiki-page">
-      <header class="wiki-head">
-        <p class="wiki-rubric">Wiki{{ with .Params.group }} · {{ . }}{{ end }}</p>
-        <h1>{{ .Title }}</h1>
-        {{ with .Params.summary }}<p class="single-summary">{{ . }}</p>{{ end }}
-      </header>
-
       {{ $hasToC := .Params.toc | default false }}
       {{ $headers := findRE "<h[2-6]" .Content }}
       {{ if and $hasToC (ge (len $headers) 2) }}
@@ -28,6 +28,6 @@
           <a href="{{ site.Params.repoURL }}/_edit/branch/main/content/{{ .Path }}" rel="nofollow">bearbeiten ↗</a>
         {{ end }}
       </div>
-    </article>
+    </div>
   </div>
 {{ end }}