Add post summaries, featured images and a page outro

Recreating gizmolab.net as a blog showed three things the design system
could not express, all of them ordinary blog features:

- Listings can show a summary and a "Read more" link instead of the whole
  post (theme.list_style). The summary is the source up to <!--more-->;
  without the marker a Markdown post is cut at a block boundary after 70
  words (never inside a code fence) and an HTML post is shown whole, since
  cutting hand-written markup blind would leave tags open. Computed at
  render time (Post.Excerpt/HasMore), nothing new is stored.
- A post can carry a featured image (posts.image, a library file that is
  unset when the file is deleted): a thumbnail floated beside the entry on
  listings, and on the post page above or below the text, or not at all,
  as theme.post_image says. The picker is the design page's imagepick; its
  library panel moves out of design.html into partials/imagelib.html so
  both forms share it — which also removes a stale pickAction call the
  design form's click handler would have hit.
- A page can have a closing text after its posts (pages.outro_md/html), in
  the intro's format: the per-page counterpart of the blog-wide "after the
  posts" module, for a home page that ends in a site map or a widget. The
  editor partial takes formatof to share another editor's Format row, and
  its upload field is now <name>_file so two editors fit in one form.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Sd8UPWrvyYCLj97JexNw3A

1 files changed, 2 insertions, 1 deletions

diff --git a/internal/web/templates/blog/page.html b/internal/web/templates/blog/page.html
index 99403ef..6f833f8 100644
--- a/internal/web/templates/blog/page.html
+++ b/internal/web/templates/blog/page.html
@@ -2,5 +2,6 @@
 {{define "content"}}
 {{if not .Data.page.IsHome}}<h1 class="page-title">{{.Data.page.Title}}</h1>{{end}}
 {{if .Data.page.IntroHTML}}<div class="intro">{{html .Data.page.IntroHTML}}</div>{{end}}
-{{if or .Data.posts .Data.page.IntroHTML}}{{template "postlist" .}}{{else}}<p class="muted">{{t "Nothing here yet."}}</p>{{end}}
+{{if or .Data.posts .Data.page.IntroHTML .Data.page.OutroHTML}}{{template "postlist" .}}{{else}}<p class="muted">{{t "Nothing here yet."}}</p>{{end}}
+{{if .Data.page.OutroHTML}}<div class="outro">{{html .Data.page.OutroHTML}}</div>{{end}}
 {{end}}