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, 7 insertions, 1 deletions

diff --git a/internal/web/theme.go b/internal/web/theme.go
index acfe158..70b218e 100644
--- a/internal/web/theme.go
+++ b/internal/web/theme.go
@@ -45,6 +45,8 @@ type Theme struct {
 	ShowDates    bool   `json:"show_dates"`
 	DateFormat   string `json:"date_format"`    // long | short | iso (rendered by i18n.FormatDate)
 	PostsPerPage int    `json:"posts_per_page"` // on listings and tag pages; one of postsPerPageChoices
+	ListStyle    string `json:"list_style"`     // full | summary (see summary.go)
+	PostImage    string `json:"post_image"`     // where the post page shows the featured image: top | bottom | list (listings only)
 
 	FooterBg    string `json:"footer_bg"`
 	FooterColor string `json:"footer_color"`
@@ -87,7 +89,7 @@ func DefaultTheme() Theme {
 		Font: "sans", HeadingFont: "same", FontSize: "normal",
 		HeaderImageHeight: "medium", HeaderAlign: "left", HeaderBg: "#2f3a4a", HeaderText: "#ffffff", TitleSize: "normal",
 		NavAlign: "left", NavStyle: "normal", NavBg: "#ffffff", NavText: "#222222",
-		ShowDates: true, DateFormat: "long", PostsPerPage: postsPerPageChoices[0],
+		ShowDates: true, DateFormat: "long", PostsPerPage: postsPerPageChoices[0], ListStyle: "full", PostImage: "top",
 		FooterBg: "#2f3a4a", FooterColor: "#d0d5dc", FooterAlign: "center",
 		LogoSize: "medium",
 		HeaderOn: true, LeftOn: true, RightOn: true, FooterOn: true, LeftWidth: 25, RightWidth: 25,
@@ -171,6 +173,8 @@ func (t *Theme) normalize() {
 	t.NavHover = optColor(t.NavHover)
 	t.DateFormat = pick(t.DateFormat, "long", "short", "iso")
 	t.PostsPerPage = pickInt(t.PostsPerPage, postsPerPageChoices...)
+	t.ListStyle = pick(t.ListStyle, "full", "summary")
+	t.PostImage = pick(t.PostImage, "top", "bottom", "list")
 	t.FooterBg = color(t.FooterBg, d.FooterBg)
 	t.FooterColor = color(t.FooterColor, d.FooterColor)
 	t.FooterAlign = pick(t.FooterAlign, "center", "left")
@@ -233,6 +237,8 @@ func ThemeFromForm(cur Theme, f url.Values) Theme {
 	t.ShowDates = on("show_dates")
 	t.DateFormat = get("date_format")
 	t.PostsPerPage = num("posts_per_page")
+	t.ListStyle = get("list_style")
+	t.PostImage = get("post_image")
 	t.FooterBg = get("footer_bg")
 	t.FooterColor = get("footer_color")
 	t.FooterAlign = get("footer_align")