feat: add CountEntries to skip decryption for list --detail (#562)

* feat: add CountEntries to skip decryption for list --detail (#549)
* test: add CountEntries and countCategory tests at browser level
* fix: address review feedback on CountRows and countLocalStorage
* test: add CountRows unit tests

browser/firefox/extract_history_test.go

@@ -7,12 +7,17 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
-func TestExtractHistories(t *testing.T) {
-	path := createTestDB(t, "places.sqlite", []string{mozPlacesSchema},
+func setupMozHistoryDB(t *testing.T) string {
+	t.Helper()
+	return createTestDB(t, "places.sqlite", []string{mozPlacesSchema},
 		insertMozPlace(1, "https://github.com", "GitHub", 100, 1700000000000000),
 		insertMozPlace(2, "https://go.dev", "Go", 50, 1710000000000000),
 		insertMozPlace(3, "https://example.com", "Example", 200, 1690000000000000),
 	)
+}
+
+func TestExtractHistories(t *testing.T) {
+	path := setupMozHistoryDB(t)
 
 	got, err := extractHistories(path)
 	require.NoError(t, err)
@@ -29,6 +34,22 @@ func TestExtractHistories(t *testing.T) {
 	assert.False(t, got[0].LastVisit.IsZero())
 }
 
+func TestCountHistories(t *testing.T) {
+	path := setupMozHistoryDB(t)
+
+	count, err := countHistories(path)
+	require.NoError(t, err)
+	assert.Equal(t, 3, count)
+}
+
+func TestCountHistories_Empty(t *testing.T) {
+	path := createTestDB(t, "places.sqlite", []string{mozPlacesSchema})
+
+	count, err := countHistories(path)
+	require.NoError(t, err)
+	assert.Equal(t, 0, count)
+}
+
 func TestExtractHistories_NullFields(t *testing.T) {
 	path := createTestDB(t, "places.sqlite", []string{mozPlacesSchema},
 		// last_visit_date=NULL, title=NULL — COALESCE should handle