fix: clarify seedance reference video failures

handler/media_reference_test.go

@@ -1,6 +1,11 @@
 package handler
 
-import "testing"
+import (
+	"path/filepath"
+	"testing"
+
+	"github.com/basketikun/infinite-canvas/config"
+)
 
 func TestNormalizeReferenceMediaTypeSupportsAudio(t *testing.T) {
 	tests := []struct {
@@ -38,3 +43,14 @@ func TestReferenceMediaTypeMaxBytes(t *testing.T) {
 		t.Fatalf("image max bytes = %d, want %d", got, referenceImageMaxBytes)
 	}
 }
+
+func TestReferenceMediaDirUsesAbsoluteSQLiteDataDir(t *testing.T) {
+	previous := config.Cfg
+	t.Cleanup(func() { config.Cfg = previous })
+	root := t.TempDir()
+	config.Cfg = config.Config{StorageDriver: "sqlite", DatabaseDSN: filepath.Join(root, "infinite-canvas.db")}
+
+	if got := referenceMediaDir(); got != filepath.Join(root, "reference-media") {
+		t.Fatalf("referenceMediaDir = %q", got)
+	}
+}