Add post tags, with a tag page and two side-column modules

Posts can now carry tags, set on the post form as a checklist of the
blog's existing tags plus a comma-separated box for new ones (no JS).
A tag is a name and a unique slug, so "Go" and "go" are one tag and
Greek tags get readable URLs; tags no post uses any more are deleted.

On the blog, tags appear under the post date and link to /tag/<slug>,
which lists the published posts from every page, paginated like a page.
Two new layout modules show them: a Tags list (with counts, by use) and
a Tag cloud (alphabetical, sized by use). Both are only fetched when a
visible module needs them.

The article loop and pager move to a shared postlist partial; while
there, the pager stops adding a trailing slash — /news/?p=2 was a 404
because a {page} wildcard never matches one.

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

1 files changed, 9 insertions, 0 deletions

diff --git a/internal/web/static/blog.css b/internal/web/static/blog.css
index d4465a2..e7a6c96 100644
--- a/internal/web/static/blog.css
+++ b/internal/web/static/blog.css
@@ -71,6 +71,15 @@ img { max-width: 100%; height: auto; }
 .col .site-nav .mod-title { padding: 0 1em; }
 .col .site-nav .nav-inner { padding: 0; }
 .col .site-nav a { display: block; padding: 0.4em 1em; }
+.post-tags { margin: -0.5em 0 0.8em; font-size: 0.85em; opacity: 0.8; }
+.post-tags a { margin-right: 0.7em; }
+.tagcloud { margin: 0; line-height: 1.8; }
+.tagcloud a { display: inline-block; margin-right: 0.5em; text-decoration: none; }
+.tc-1 { font-size: 0.85em; opacity: 0.75; }
+.tc-2 { font-size: 1em; }
+.tc-3 { font-size: 1.2em; }
+.tc-4 { font-size: 1.45em; }
+.tc-5 { font-size: 1.75em; }
 .mod-archive details { margin: 0.2em 0; }
 .mod-archive details details { margin-left: 1em; }
 .mod-archive summary { cursor: pointer; padding: 0.15em 0; }