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, 1 insertions, 1 deletions

diff --git a/internal/web/templates/dashboard/layout.html b/internal/web/templates/dashboard/layout.html
index 48b6778..5c9332a 100644
--- a/internal/web/templates/dashboard/layout.html
+++ b/internal/web/templates/dashboard/layout.html
@@ -102,7 +102,7 @@
       </td>
       <td>{{t (index $r.Data.names .Kind)}}{{with modsummary .}} <span class="muted">— {{.}}</span>{{end}}
         {{if and (eq .Kind "logo") (not $r.Data.theme.Logo)}}<span class="tag off">{{t "no logo chosen"}}</span> <span class="muted small">{{t "pick one on the"}} <a href="/b/{{$r.Blog.Subdomain}}/design#logo">{{t "Design"}}</a> {{t "tab."}}</span>{{end}}</td>
-      <td class="nowrap actions">{{if modsettings .Kind}}<a href="{{$u}}/modules/{{.ID}}/edit">{{t "edit"}}</a> {{end}}<a class="danger" href="{{$u}}/modules/{{.ID}}/delete">{{t "remove"}}</a></td>
+      <td class="nowrap actions">{{if modsettings .}}<a href="{{$u}}/modules/{{.ID}}/edit">{{t "edit"}}</a> {{end}}<a class="danger" href="{{$u}}/modules/{{.ID}}/delete">{{t "remove"}}</a></td>
     </tr>{{end}}
   </table>{{else}}<p class="muted">{{if ne $area "header"}}{{t "Nothing here yet — this area is not shown until you add a module."}}{{else}}{{t "Nothing here yet."}}{{end}}</p>{{end}}
   <form method="post" action="{{$u}}/areas/{{$area}}/add" class="addmod">