Cards as default list template — all sections render as card grids

list.html: each page becomes a data-card with tag header, title,
summary excerpt, and date footer. Used for /writings/, /tags/*, etc.

Card styling refined: uppercase category header, date in footer,
dimmed summary text.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

layouts/_default/list.html

@@ -0,0 +1,27 @@
+{{ define "main" }}
+<section>
+  <header>
+    <h1>{{ .Title }}</h1>
+    {{- with .Description }}<p data-text="dim">{{ . }}</p>{{- end }}
+  </header>
+
+  <div data-layout="card-grid">
+    {{- range .Pages }}
+    <article data-card>
+      {{- with .Params.tags }}
+      <header>{{ index . 0 }}</header>
+      {{- end }}
+      <h4><a href="{{ .RelPermalink }}">{{ .Title }}</a></h4>
+      {{- with .Summary }}
+      <p>{{ . | plainify | truncate 140 }}</p>
+      {{- end }}
+      {{- if not .Date.IsZero }}
+      <footer>
+        <time datetime="{{ .Date.Format "2006-01-02" }}">{{ .Date.Format "Jan 2, 2006" }}</time>
+      </footer>
+      {{- end }}
+    </article>
+    {{- end }}
+  </div>
+</section>
+{{ end }}