Add a search box module and a search page

Readers had no way to find a post. The new "search" module goes in the
header (a bar under the nav) or a side column (a box with a heading) and
is a plain GET form to /search, so it works without JavaScript. The
results page lists the published posts of every page whose title or
Markdown body matches the query — case-insensitive, each word literal,
spaces meaning "anything in between", in order — as title, date and a
short snippet with the match marked, 20 per page.

modules.kind is a CHECK constraint, so a migration widens it; "search"
becomes a reserved page slug so the literal route keeps winning over
/{page}. moduleHasSettings now takes the module: a header search box
has no heading, hence nothing to edit.

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

1 files changed, 23 insertions, 0 deletions

diff --git a/internal/web/templates/blog/search.html b/internal/web/templates/blog/search.html
new file mode 100644
index 0000000..b146f5e
--- /dev/null
+++ b/internal/web/templates/blog/search.html
@@ -0,0 +1,23 @@
+{{define "title"}}{{if .Data.q}}{{tf "Results for “%s”" .Data.q}}{{else}}{{t "Search"}}{{end}} · {{.Blog.Title}}{{end}}
+{{define "content"}}
+<h1 class="page-title">{{if .Data.q}}{{tf "Results for “%s”" .Data.q}}{{else}}{{t "Search"}}{{end}}</h1>
+<div class="search-page">{{template "searchform" .}}</div>
+{{if not .Data.q}}<p class="muted">{{t "Type a word or two to find posts."}}</p>
+{{else if not .Data.hits}}<p class="muted">{{tf "Nothing matched “%s”." .Data.q}}</p>
+{{else}}
+<p class="muted small">{{if eq .Data.total 1}}{{t "One post matches."}}{{else}}{{tf "%d posts match." .Data.total}}{{end}}</p>
+<ul class="search-results">
+{{range .Data.hits}}<li>
+  <a href="/{{.PageSlug}}/{{.Slug}}">{{.Title}}</a>{{if $.Data.theme.ShowDates}} <span class="post-date">{{postdate $.Data.theme.DateFormat .CreatedAt}}</span>{{end}}
+  <p class="snippet">{{.Snippet}}</p>
+</li>
+{{end}}</ul>
+{{if gt .Data.lastPage 1}}
+<div class="pager">
+  {{if gt .Data.pageNum 1}}<a href="/search?q={{.Data.q}}&amp;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="/search?q={{.Data.q}}&amp;p={{add .Data.pageNum 1}}">{{t "Older"}} &rarr;</a>{{end}}
+</div>
+{{end}}
+{{end}}
+{{end}}