fix: handle NULL title when negating any_text / title: search

Wrap the title LIKE clause in a Brackets predicate that also matches
'media.metadata.title IS NULL' when the query is negated. Without this,
photos with no title (the common case) are excluded from negated any_text
results because NULL NOT LIKE 'x' evaluates to NULL (three-valued logic),
which fails the AND-chain that negation builds.

Mirrors the existing pattern used for array fields (keywords/persons) at
matchArrayField — text-typed sparse fields need the same treatment.

Author: cat101

src/backend/model/database/SearchManager.ts

@@ -1025,9 +1025,19 @@ export class SearchManager {
         (query.type === SearchQueryTypes.any_text && !directoryOnly) ||
         query.type === SearchQueryTypes.title
       ) {
+        // title is sparse: most photos have no title set. When negating, treat
+        // NULL as a match so a `-title:X` (or negated any_text) doesn't filter
+        // out untitled photos due to NULL NOT LIKE = NULL three-valued logic.
         q[whereFN](
-          `media.metadata.title ${LIKE} :text${queryId} COLLATE ${SQL_COLLATE}`,
-          textParam
+          new Brackets((qbr): void => {
+            qbr.where(
+              `media.metadata.title ${LIKE} :text${queryId} COLLATE ${SQL_COLLATE}`,
+              textParam
+            );
+            if ((query as TextSearch).negate) {
+              qbr.orWhere('media.metadata.title IS NULL');
+            }
+          })
         );
       }