fix: Add context.Background() to sqlite.New() calls in test files

Multiple test files were still using the old sqlite.New(path) signature
instead of the new sqlite.New(ctx, path) signature. This was causing
compilation failures in the test suite.

Fixed files:
- internal/importer/importer_test.go
- internal/importer/external_ref_test.go
- internal/importer/timestamp_test.go
- internal/rpc/limits_test.go
- internal/rpc/list_filters_test.go
- internal/rpc/rpc_test.go
- internal/rpc/status_test.go
- internal/syncbranch/syncbranch_test.go

internal/importer/external_ref_test.go

@@ -22,7 +22,7 @@ func TestImportWithExternalRef(t *testing.T) {
 	dbPath := filepath.Join(tmpDir, "test.db")
 
 	// Create database
-	store, err := sqlite.New(dbPath)
+	store, err := sqlite.New(context.Background(), dbPath)
 	if err != nil {
 		t.Fatalf("Failed to create database: %v", err)
 	}
@@ -106,7 +106,7 @@ func TestImportWithExternalRefDifferentID(t *testing.T) {
 	dbPath := filepath.Join(tmpDir, "test.db")
 
 	// Create database
-	store, err := sqlite.New(dbPath)
+	store, err := sqlite.New(context.Background(), dbPath)
 	if err != nil {
 		t.Fatalf("Failed to create database: %v", err)
 	}
@@ -197,7 +197,7 @@ func TestImportLocalIssueNotOverwrittenByExternalRef(t *testing.T) {
 	dbPath := filepath.Join(tmpDir, "test.db")
 
 	// Create database
-	store, err := sqlite.New(dbPath)
+	store, err := sqlite.New(context.Background(), dbPath)
 	if err != nil {
 		t.Fatalf("Failed to create database: %v", err)
 	}
@@ -295,7 +295,7 @@ func TestImportExternalRefTimestampCheck(t *testing.T) {
 	dbPath := filepath.Join(tmpDir, "test.db")
 
 	// Create database
-	store, err := sqlite.New(dbPath)
+	store, err := sqlite.New(context.Background(), dbPath)
 	if err != nil {
 		t.Fatalf("Failed to create database: %v", err)
 	}