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, 6 insertions, 0 deletions

diff --git a/internal/web/templates/layouts/blog.html b/internal/web/templates/layouts/blog.html
index f73f729..cf00272 100644
--- a/internal/web/templates/layouts/blog.html
+++ b/internal/web/templates/layouts/blog.html
@@ -70,6 +70,12 @@
     </details>{{end}}
   </details>{{else}}<p class="muted">{{t "No posts yet."}}</p>{{end}}
 </div>
+{{- else if eq $m.Kind "tags"}}<div class="mod mod-tags">{{template "modtitle" $m}}
+  <ul>{{range $i, $t := $r.Data.tags}}{{if or (eq $m.Count 0) (lt $i $m.Count)}}<li><a href="/tag/{{$t.Slug}}">{{$t.Name}}</a> <span class="muted">({{$t.Count}})</span></li>{{end}}{{else}}<li class="muted">{{t "No tags yet."}}</li>{{end}}</ul>
+</div>
+{{- else if eq $m.Kind "tagcloud"}}<div class="mod mod-tagcloud">{{template "modtitle" $m}}
+  <p class="tagcloud">{{range $r.Data.tagcloud}}<a class="tc-{{.Size}}" href="/tag/{{.Slug}}" title="{{.Count}}">{{.Name}}</a> {{else}}<span class="muted">{{t "No tags yet."}}</span>{{end}}</p>
+</div>
 {{- else if eq $m.Kind "html"}}{{if not $m.Body}}{{else if or (eq $m.Area "above") (eq $m.Area "below")}}<div class="custom-html custom-html-{{$m.Area}}">{{html $m.Body}}</div>
 {{else}}<div class="mod mod-html">{{template "modtitle" $m}}{{html $m.Body}}</div>{{end}}
 {{- else if eq $m.Kind "rss"}}<p class="mod mod-rss small"><a href="/feed.xml">{{t "RSS feed"}}</a></p>