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

3 files changed, 7 insertions, 14 deletions

diff --git a/internal/web/templates/blog/page.html b/internal/web/templates/blog/page.html
index ac6a609..99403ef 100644
--- a/internal/web/templates/blog/page.html
+++ b/internal/web/templates/blog/page.html
@@ -2,18 +2,5 @@
 {{define "content"}}
 {{if not .Data.page.IsHome}}<h1 class="page-title">{{.Data.page.Title}}</h1>{{end}}
 {{if .Data.page.IntroHTML}}<div class="intro">{{html .Data.page.IntroHTML}}</div>{{end}}
-{{range .Data.posts}}
-<article class="post">
-  <h2 class="post-title"><a href="/{{.PageSlug}}/{{.Slug}}">{{.Title}}</a></h2>
-  {{if $.Data.theme.ShowDates}}<p class="post-date">{{postdate $.Data.theme.DateFormat .CreatedAt}}</p>{{end}}
-  <div class="post-body">{{html .BodyHTML}}</div>
-</article>
-{{else}}{{if not .Data.page.IntroHTML}}<p class="muted">{{t "Nothing here yet."}}</p>{{end}}{{end}}
-{{if gt .Data.lastPage 1}}
-<div class="pager">
-  {{if gt .Data.pageNum 1}}<a href="{{.Data.base}}/?p={{sub .Data.pageNum 1}}">&larr; {{t "Newer"}}</a>{{end}}
-  <span>{{tf "Page %d of %d" .Data.pageNum .Data.lastPage}}</span>
-  {{if lt .Data.pageNum .Data.lastPage}}<a href="{{.Data.base}}/?p={{add .Data.pageNum 1}}">{{t "Older"}} &rarr;</a>{{end}}
-</div>
-{{end}}
+{{if or .Data.posts .Data.page.IntroHTML}}{{template "postlist" .}}{{else}}<p class="muted">{{t "Nothing here yet."}}</p>{{end}}
 {{end}}
diff --git a/internal/web/templates/blog/post.html b/internal/web/templates/blog/post.html
index d14f22a..a3b0375 100644
--- a/internal/web/templates/blog/post.html
+++ b/internal/web/templates/blog/post.html
@@ -3,6 +3,7 @@
 <article class="post single">
   <h1 class="post-title">{{.Data.post.Title}}</h1>
   <p class="post-date">{{if .Data.theme.ShowDates}}{{postdate .Data.theme.DateFormat .Data.post.CreatedAt}} &middot; {{end}}<a href="{{if .Data.page.IsHome}}/{{else}}/{{.Data.page.Slug}}{{end}}">{{.Data.page.Title}}</a></p>
+  {{template "posttags" .Data.post.Tags}}
   <div class="post-body">{{html .Data.post.BodyHTML}}</div>
 </article>
 {{end}}
diff --git a/internal/web/templates/blog/tag.html b/internal/web/templates/blog/tag.html
new file mode 100644
index 0000000..fd3aa13
--- /dev/null
+++ b/internal/web/templates/blog/tag.html
@@ -0,0 +1,5 @@
+{{define "title"}}{{tf "Tagged “%s”" .Data.tag.Name}} · {{.Blog.Title}}{{end}}
+{{define "content"}}
+<h1 class="page-title">{{tf "Tagged “%s”" .Data.tag.Name}}</h1>
+{{template "postlist" .}}
+{{end}}