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, 11 insertions, 9 deletions

diff --git a/internal/store/pages.go b/internal/store/pages.go
index 74da379..08af9fe 100644
--- a/internal/store/pages.go
+++ b/internal/store/pages.go
@@ -11,7 +11,9 @@ type Page struct {
 	Title     string
 	IntroMD   string
 	IntroHTML string
-	Format    string // FormatMarkdown | FormatHTML: how IntroMD is read
+	OutroMD   string // shown after the posts
+	OutroHTML string
+	Format    string // FormatMarkdown | FormatHTML: how IntroMD and OutroMD are read
 	NavOrder  int
 	ShowInNav bool // derived: the page has a menu entry
 	IsHome    bool
@@ -19,11 +21,11 @@ type Page struct {
 	PostCount int // filled by ListPages only
 }
 
-const pageCols = `id, slug, title, intro_md, intro_html, format, nav_order, EXISTS (SELECT 1 FROM menu_items m WHERE m.page_id=pages.id), is_home, created_at`
+const pageCols = `id, slug, title, intro_md, intro_html, outro_md, outro_html, format, nav_order, EXISTS (SELECT 1 FROM menu_items m WHERE m.page_id=pages.id), is_home, created_at`
 
 func scanPage(row interface{ Scan(...any) error }) (*Page, error) {
 	var p Page
-	err := row.Scan(&p.ID, &p.Slug, &p.Title, &p.IntroMD, &p.IntroHTML, &p.Format, &p.NavOrder, &p.ShowInNav, &p.IsHome, &p.CreatedAt)
+	err := row.Scan(&p.ID, &p.Slug, &p.Title, &p.IntroMD, &p.IntroHTML, &p.OutroMD, &p.OutroHTML, &p.Format, &p.NavOrder, &p.ShowInNav, &p.IsHome, &p.CreatedAt)
 	if err != nil {
 		return nil, wrap(err)
 	}
@@ -40,7 +42,7 @@ func (bs *BlogStore) ListPages(ctx context.Context) ([]Page, error) {
 	var out []Page
 	for rows.Next() {
 		var p Page
-		if err := rows.Scan(&p.ID, &p.Slug, &p.Title, &p.IntroMD, &p.IntroHTML, &p.Format, &p.NavOrder, &p.ShowInNav, &p.IsHome, &p.CreatedAt, &p.PostCount); err != nil {
+		if err := rows.Scan(&p.ID, &p.Slug, &p.Title, &p.IntroMD, &p.IntroHTML, &p.OutroMD, &p.OutroHTML, &p.Format, &p.NavOrder, &p.ShowInNav, &p.IsHome, &p.CreatedAt, &p.PostCount); err != nil {
 			return nil, err
 		}
 		out = append(out, p)
@@ -68,9 +70,9 @@ func (bs *BlogStore) CreatePage(ctx context.Context, p *Page) (*Page, error) {
 		return nil, err
 	}
 	defer tx.Rollback(ctx)
-	created, err := scanPage(tx.QueryRow(ctx, `INSERT INTO pages (slug, title, intro_md, intro_html, format, nav_order)
-		VALUES ($1,$2,$3,$4,$5,(SELECT coalesce(max(nav_order),-1)+1 FROM pages)) RETURNING `+pageCols,
-		p.Slug, p.Title, p.IntroMD, p.IntroHTML, formatOrMD(p.Format)))
+	created, err := scanPage(tx.QueryRow(ctx, `INSERT INTO pages (slug, title, intro_md, intro_html, outro_md, outro_html, format, nav_order)
+		VALUES ($1,$2,$3,$4,$5,$6,$7,(SELECT coalesce(max(nav_order),-1)+1 FROM pages)) RETURNING `+pageCols,
+		p.Slug, p.Title, p.IntroMD, p.IntroHTML, p.OutroMD, p.OutroHTML, formatOrMD(p.Format)))
 	if err != nil {
 		return nil, err
 	}
@@ -90,8 +92,8 @@ func (bs *BlogStore) UpdatePage(ctx context.Context, p *Page) error {
 		return err
 	}
 	defer tx.Rollback(ctx)
-	if _, err := tx.Exec(ctx, `UPDATE pages SET slug=$2, title=$3, intro_md=$4, intro_html=$5, format=$6 WHERE id=$1`,
-		p.ID, p.Slug, p.Title, p.IntroMD, p.IntroHTML, formatOrMD(p.Format)); err != nil {
+	if _, err := tx.Exec(ctx, `UPDATE pages SET slug=$2, title=$3, intro_md=$4, intro_html=$5, outro_md=$6, outro_html=$7, format=$8 WHERE id=$1`,
+		p.ID, p.Slug, p.Title, p.IntroMD, p.IntroHTML, p.OutroMD, p.OutroHTML, formatOrMD(p.Format)); err != nil {
 		return wrap(err)
 	}
 	if p.ShowInNav {