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, 0 deletions

diff --git a/internal/web/templates/dashboard/post_form.html b/internal/web/templates/dashboard/post_form.html
index 70cddcc..9bd7624 100644
--- a/internal/web/templates/dashboard/post_form.html
+++ b/internal/web/templates/dashboard/post_form.html
@@ -39,6 +39,7 @@
     </script>
     <label for="ed-body">{{t "Content"}}</label>
     {{template "editor" (dict "name" "body" "value" .Data.post.BodyMD "format" .Data.post.Format "rows" 24 "tall" true "upload" (print "/b/" .Blog.Subdomain "/files/upload") "preview" (print "/b/" .Blog.Subdomain "/preview") "csrf" .CSRF)}}
+    {{template "imagepick" (dict "name" "image" "current" .Data.post.Image "sub" .Blog.Subdomain "images" .Data.images "names" .Data.imageNames "label" (t "Featured image") "hint" (t "Optional. A thumbnail on listings, and on the post page where the Design tab puts it."))}}
     <label class="check"><input type="checkbox" name="published"{{if .Data.post.Published}} checked{{end}}> {{t "Visible on the blog"}}</label>
     <p class="actionrow">
       <button type="submit">{{t "Save"}}</button>
@@ -47,4 +48,5 @@
     </p>
   </form>
 </div>
+{{template "imagelib" (dict "sub" .Blog.Subdomain "count" .Data.imageCount)}}
 {{end}}