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, 1 insertions, 1 deletions

diff --git a/internal/web/templates/blog/page.html b/internal/web/templates/blog/page.html
index c1fe726..ba78ff6 100644
--- a/internal/web/templates/blog/page.html
+++ b/internal/web/templates/blog/page.html
@@ -5,7 +5,7 @@
 {{range .Data.posts}}
 <article class="post">
   <h2 class="post-title"><a href="/{{.PageSlug}}/{{.Slug}}">{{.Title}}</a></h2>
-  <p class="post-date">{{date .CreatedAt}}</p>
+  {{if $.Data.theme.ShowDates}}<p class="post-date">{{$.Data.theme.FormatDate .CreatedAt}}</p>{{end}}
   <div class="post-body">{{html .BodyHTML}}</div>
 </article>
 {{else}}{{if not .Data.page.IntroHTML}}<p class="muted">Nothing here yet.</p>{{end}}{{end}}