fix: show TerminalPost in search results when field sort is active or mostRelevantPost is unavailable

When params.q is set, Flarum core suppresses TerminalPost and only shows an
excerpt from mostRelevantPost. This leaves the info section empty when the post
is null (e.g. hidden/deleted first post in production) or when results are
ordered by a field sort where an excerpt is meaningless.

Extend DiscussionListItem.infoItems to:
- Replace excerpt with TerminalPost when a field sort (latest, oldest, top) is
  active — relevance excerpts are not meaningful when sorted by date/count.
- Fall back to TerminalPost when no excerpt was added (mostRelevantPost null).

js/src/forum/extendDiscussionListItem.tsx

@@ -0,0 +1,26 @@
+import { extend } from 'flarum/common/extend';
+import DiscussionListItem from 'flarum/forum/components/DiscussionListItem';
+import TerminalPost from 'flarum/forum/components/TerminalPost';
+
+export default function extendDiscussionListItem() {
+  extend(DiscussionListItem.prototype, 'infoItems', function (items) {
+    const params = this.attrs.params;
+
+    if (!params.q) return;
+
+    const hasFieldSort = params.sort && params.sort !== 'relevance';
+
+    if (hasFieldSort) {
+      // Field sort active (latest, oldest, top, …): replace excerpt with TerminalPost.
+      // An excerpt is meaningless when results are ordered by date/count rather than relevance.
+      items.remove('excerpt');
+      if (!items.has('terminalPost')) {
+        items.add('terminalPost', <TerminalPost discussion={this.attrs.discussion} lastPost={!this.showFirstPost()} />);
+      }
+    } else if (!items.has('excerpt')) {
+      // Relevance mode but no excerpt (mostRelevantPost was null or non-comment type).
+      // Fall back to TerminalPost so the info section is never silently empty.
+      items.add('terminalPost', <TerminalPost discussion={this.attrs.discussion} lastPost={true} />);
+    }
+  });
+}

js/src/forum/index.ts

@@ -7,6 +7,7 @@ import ItemList from 'flarum/common/utils/ItemList';
 
 import DiscussionsSearchSource from './SearchSources/DiscussionsSearchSource';
 import extendDiscussionState from './PaginatedListStates/extendDiscussionState';
+import extendDiscussionListItem from './extendDiscussionListItem';
 
 app.initializers.add('blomstra-search', () => {
   extend(Search.prototype, 'sourceItems', function (this: Search<SearchAttrs>, items: ItemList<SearchSource>) {
@@ -25,6 +26,7 @@ app.initializers.add(
   'blomstra-search-early',
   () => {
     extendDiscussionState();
+    extendDiscussionListItem();
   },
   999999
 );