Add a favicon and rework the Design page

Blogs had no icon at all, and browsers probing /favicon.ico ended up
rendering the 404 page. Ship a default paper & ink icon (svg + png) and
let each blog replace it from the Design page; /favicon.ico now serves
the default or redirects to the blog's own image. ICO uploads accepted.

The Design page gains colour schemes, reset to defaults, thumbnail
image pickers, jump links and a sticky save bar, plus new options:
heading font, link underline/hover, content box style and padding,
header image height, post dates and format, footer RSS toggle, menu
alignment/style/hover and sidebar width. The Menu card picks the
position with illustrated tiles and shows only the options that apply
to it, using CSS :checked rules rather than JavaScript.

All new defaults reproduce the previous look, so existing blogs are
unchanged until edited. Theme is jsonb, so no migration.

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

1 files changed, 4 insertions, 0 deletions

diff --git a/internal/web/routes.go b/internal/web/routes.go
index bd39a18..84b19a6 100644
--- a/internal/web/routes.go
+++ b/internal/web/routes.go
@@ -48,6 +48,8 @@ func (s *Server) rootRoutes() http.Handler {
 	m.HandleFunc("POST /b/{sub}/announcements/{id}/toggle", s.withBlog(s.handleSectionToggle))
 	m.HandleFunc("GET /b/{sub}/design", s.withBlog(s.handleDesignForm))
 	m.HandleFunc("POST /b/{sub}/design", s.withBlog(s.handleDesign))
+	m.HandleFunc("POST /b/{sub}/design/preset", s.withBlog(s.handleDesignPreset))
+	m.HandleFunc("POST /b/{sub}/design/reset", s.withBlog(s.handleDesignReset))
 	m.HandleFunc("GET /b/{sub}/images", s.withBlog(s.handleImages))
 	m.HandleFunc("POST /b/{sub}/images/upload", s.withBlog(s.handleImageUpload))
 	m.HandleFunc("POST /b/{sub}/images/{id}/delete", s.withBlog(s.handleImageDelete))
@@ -64,6 +66,7 @@ func (s *Server) rootRoutes() http.Handler {
 
 	m.HandleFunc("GET /media/{id}", s.handleMedia)
 	m.Handle("GET /static/{file}", s.staticHandler())
+	m.HandleFunc("GET /favicon.ico", s.hostBlog(s.handleFavicon))
 	// The root domain also serves the superadmin's blog. Literal routes above win
 	// over these wildcards; see reservedPageSlugs for the names that are shadowed.
 	s.blogRoutes(m, s.hostBlog)
@@ -84,6 +87,7 @@ func (s *Server) subdomainRoutes() http.Handler {
 	m.HandleFunc("GET /webadmin", s.handleWebadminRedirect)
 	m.HandleFunc("GET /media/{id}", s.handleMedia)
 	m.Handle("GET /static/{file}", s.staticHandler())
+	m.HandleFunc("GET /favicon.ico", s.hostBlog(s.handleFavicon))
 	s.blogRoutes(m, s.hostBlog)
 	return m
 }