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, 8 insertions, 1 deletions

diff --git a/internal/web/handlers_pages.go b/internal/web/handlers_pages.go
index cf72d39..40456f2 100644
--- a/internal/web/handlers_pages.go
+++ b/internal/web/handlers_pages.go
@@ -59,13 +59,18 @@ func (s *Server) handlePageSave(w http.ResponseWriter, r *http.Request) {
 	p.Title = strings.TrimSpace(r.FormValue("title"))
 	p.Slug = strings.TrimSpace(r.FormValue("slug"))
 	p.IntroMD = strings.ReplaceAll(r.FormValue("intro"), "\r\n", "\n")
+	p.OutroMD = strings.ReplaceAll(r.FormValue("outro"), "\r\n", "\n")
 	p.Format = pick(r.FormValue("format"), store.FormatMarkdown, store.FormatHTML)
 	p.ShowInNav = r.FormValue("show_in_nav") == "on"
 	autoSlug := p.Slug == ""
 	if autoSlug {
 		p.Slug = slug.Make(p.Title)
 	}
-	img, err := s.readUpload(r, "inline_file", false)
+	img, err := s.readUpload(r, "intro_file", false)
+	outroImg, err2 := s.readUpload(r, "outro_file", false)
+	if err == nil {
+		err = err2
+	}
 	var msg string
 	switch {
 	case err != nil:
@@ -81,6 +86,8 @@ func (s *Server) handlePageSave(w http.ResponseWriter, r *http.Request) {
 	}
 	p.IntroMD = appendFile(p.IntroMD, img, p.Format)
 	p.IntroHTML = renderBody(p.Format, p.IntroMD)
+	p.OutroMD = appendFile(p.OutroMD, outroImg, p.Format)
+	p.OutroHTML = renderBody(p.Format, p.OutroMD)
 	base := p.Slug
 	for n := 1; ; n++ { // generated slugs get -2, -3… on collision; typed ones report the conflict
 		p.Slug = slug.WithSuffix(base, n)