ui(wiki): vollbreiter Header wie Library (gleiche max-width), Spalten darunter

Wiki-Header (section-header) spannt jetzt die volle Spalte (grid-column 1/-1)
und die .wiki-Box hat dieselbe max-width/Zentrierung wie der normale Inhalt —
so fluchten Library- und Wiki-Header. Seitenleiste + Inhalt darunter.

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

assets/css/custom.css

@@ -719,9 +719,19 @@ a.byline-author:hover, a.journal-author:hover { color: var(--accent); }
 .dialog-hint { font-size: var(--font-size-small); color: var(--color-text-muted); align-self: center; opacity: 0.7; }
 .dialog-spacer { flex: 1; }
 
-/* ── Wiki: zweispaltig (Seitenleiste + Inhalt), schlicht ── */
-.wiki { display: grid; grid-template-columns: 220px 1fr; gap: 2.6em; align-items: start; width: 100%; }
-@media (max-width: 760px) { .wiki { grid-template-columns: 1fr; gap: 1.4em; } .wiki-side { position: static; } }
+/* ── Wiki: vollbreiter Section-Header (wie Library) + zwei Spalten darunter.
+   Gleiche max-width/Zentrierung wie der normale Inhalt → Wiki- und Library-
+   Header fluchten exakt. ── */
+.wiki {
+  display: grid;
+  grid-template-columns: 200px 1fr;
+  column-gap: 2.6em; row-gap: var(--spacing-sm);
+  align-items: start;
+  max-width: calc(var(--container-width) + 3.5rem);
+  margin-inline: auto;
+}
+.wiki > .section-header { grid-column: 1 / -1; margin-top: 0; }
+@media (max-width: 760px) { .wiki { grid-template-columns: 1fr; column-gap: 0; } .wiki-side { position: static; } }
 .wiki-side { position: sticky; top: 1em; align-self: start; }
 .wiki-nav { display: flex; flex-direction: column; gap: 0.35em; font-size: var(--font-size-small); }
 .wiki-nav-home { text-decoration: none; color: var(--color-text-primary); font-weight: 600; }
@@ -738,9 +748,6 @@ 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; }
-/* Header sitzt in der Inhaltsspalte → fluchtet mit dem Text; Oberkante mit der
-   Seitenleiste gleichziehen (section-header bringt sonst margin-top mit). */
-.wiki-page .section-header { margin-top: 0; }
 .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

@@ -1,11 +1,11 @@
 {{ define "main" }}
   <div class="wiki">
-    <aside class="wiki-side">{{ partial "wiki-nav.html" . }}</aside>
-
-    <div class="wiki-page">
     <header class="section-header">
       <h1 class="section-title">{{ .Title }}</h1>
     </header>
+    <aside class="wiki-side">{{ partial "wiki-nav.html" . }}</aside>
+
+    <div class="wiki-page">
       <div class="single-content">{{ .Content }}</div>
 
       {{ $pages := where site.RegularPages "Section" "wiki" }}

layouts/wiki/single.html

@@ -1,14 +1,13 @@
 {{ define "main" }}
   <div class="wiki">
-    <aside class="wiki-side">{{ partial "wiki-nav.html" . }}</aside>
-
-    <div class="wiki-page">
     <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>
+    <aside class="wiki-side">{{ partial "wiki-nav.html" . }}</aside>
 
+    <div class="wiki-page">
       {{ $hasToC := .Params.toc | default false }}
       {{ $headers := findRE "<h[2-6]" .Content }}
       {{ if and $hasToC (ge (len $headers) 2) }}