fix: case-insensitive ids via query language and caching

mount_test.go

@@ -101,6 +101,9 @@ func TestLazyByIDShardFetchesMatchingPrefix(t *testing.T) {
 	if len(entries) != 1 || entries[0].Name != "it-item-1.pdf" {
 		t.Fatalf("unexpected shard entries: %#v", entries)
 	}
+	if _, err := shard.(*lazyByIDShardNode).Lookup(context.Background(), "it-item-1.pdf"); err != nil {
+		t.Fatal(err)
+	}
 	if len(queries) != 2 || queries[0] != "id:it*" || queries[1] != "id:it*" {
 		t.Fatalf("unexpected queries: %v", queries)
 	}
@@ -130,6 +133,14 @@ func TestLazyByIDListsEveryPrefixWithoutSearching(t *testing.T) {
 	if !found {
 		t.Fatalf("expected 7j directory in %#v", entries)
 	}
+	if _, err := byID.(*lazyByIDNode).Lookup(context.Background(), "7J"); err == nil {
+		t.Fatal("expected uppercase ID prefix lookup to fail")
+	}
+	for _, prefix := range []string{"-_", "_o", ".@"} {
+		if _, err := byID.(*lazyByIDNode).Lookup(context.Background(), prefix); err != nil {
+			t.Fatalf("expected %q ID prefix lookup to succeed: %v", prefix, err)
+		}
+	}
 }
 
 func TestBuildMountTreeGroupsByFolderAndDate(t *testing.T) {