Add weeknote for March 28-April 3, 2026; update now and upcoming pages

Render hook updated to wrap images with titles in <figure>/<figcaption>
instead of using title attributes, giving visible captions and cleaner
accessibility. Applies retroactively to all existing posts.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

layouts/_default/_markup/render-image.html

@@ -1 +1,8 @@
-<img src="{{ .Destination | safeURL }}" alt="{{ .Text }}"{{ with .Title }} title="{{ . }}"{{ else }} title="{{ $.Text }}"{{ end }} />
+{{- with .Title -}}
+<figure>
+  <img src="{{ $.Destination | safeURL }}" alt="{{ $.Text }}" />
+  <figcaption>{{ . }}</figcaption>
+</figure>
+{{- else -}}
+<img src="{{ .Destination | safeURL }}" alt="{{ .Text }}" />
+{{- end -}}