Unified search: use ANY-mode tag matching, not ALL

ALL-mode over-constrains NL queries — the model maps several query words to
tags and few photos carry every one, zeroing the candidate set. Switch to
ANY (a photo matches if it has any named tag); the semantic CLIP ranking
provides precision within that pool. Exclude tags still filter out.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/unified_search.rs

@@ -264,13 +264,15 @@ pub async fn unified_search<TagD: TagDao>(
     let mut allowed_hashes: HashSet<String> = HashSet::new();
     if has_struct {
         // Tag membership set (rel_path only — same cross-library imprecision
-        // as the existing /photos tag listing). ALL-mode: the photo must
-        // carry every named tag.
+        // as the existing /photos tag listing). ANY-mode: a photo matches if
+        // it carries any of the named tags. ALL-mode over-constrains NL
+        // queries (the model maps several words to tags and few photos carry
+        // them all); the semantic term does the precision work instead.
         let tag_set: Option<HashSet<String>> = if sq.tag_ids.is_empty() {
             None
         } else {
             let mut dao = tag_dao.lock().expect("tag dao");
-            match dao.get_files_with_all_tag_ids(
+            match dao.get_files_with_any_tag_ids(
                 sq.tag_ids.clone(),
                 sq.exclude_tag_ids.clone(),
                 &ctx,