feat: wiki badge and /wiki links in global search results

Override Harmony's search partials so results tagged by the wiki plugin
(isWikiArticle + wikiPath) show a gold Wiki badge and link to /wiki/...
instead of /post/..., in the quick-search dropdown and both /search views.
Forum results render unchanged; posts_list_item is shared with account and
group pages, where the flags are never set and the conditional no-ops.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

theme.scss

@@ -7,6 +7,7 @@
 @import "./scss/westgate/categories";
 @import "./scss/westgate/topics";
 @import "./scss/westgate/posts";
+@import "./scss/westgate/search";
 @import "./scss/westgate/controls";
 @import "./scss/westgate/widgets";
 @import "./scss/westgate/responsive";