add low-boost title autocomplete match to full search

src/Api/Controllers/SearchController.php

@@ -317,6 +317,15 @@ class SearchController extends ListDiscussionsController
     protected function buildTextQuery(string $search, User $actor, bool $needsScoring = false): BoolQuery
     {
         $textQuery = BoolQuery::create();
+		// Low-weight prefix match on title.autocomplete for the full search page.
+        // Exact / normal title matches should still rank higher than prefix-only hits.
+        $textQuery->add(
+            (new MatchQuery('title.autocomplete', $search))
+                ->operator('and')
+                ->boost(0.35),
+            'should'
+        );
+
 
         if ($this->discussionSearcher?->enabled()) {
             $textQuery->add($this->buildShouldClauses($search, $this->discussionSearcher->boost()), 'should');