fix(elements): correctly detect parenthesized XPath expressions

Some valid XPath expressions are wrapped in parentheses, e.g.
`(//div)[last()]`. These were previously misclassified as CSS
selectors. Added explicit detection for '(/' prefix in
`_get_expression_type`.

test(elements): add cases for '(//div)[last()]' and similar XPath

Author: Cvoluj

pydoll/elements/mixins/find_elements_mixin.py

@@ -478,7 +478,7 @@ def _get_expression_type(expression: str) -> By:
         - XPath: starts with ./, or /
         - Default: CSS_SELECTOR
         """
-        if expression.startswith('./') or expression.startswith('/'):
+        if expression.startswith('./') or expression.startswith('/') or expression.startswith('(/'):
             return By.XPATH
 
         return By.CSS_SELECTOR

tests/test_find_elements_mixin.py

@@ -201,6 +201,16 @@ def test_edge_case_expressions(self):
         # Empty string should default to CSS
         assert FindElementsMixin._get_expression_type('') == By.CSS_SELECTOR
 
+    def test_xpath_with_parentheses_and_predicate(self):
+        """Test XPath detection with parentheses, e.g. (//div)[last()]."""
+        expressions = [
+            '(//div)[last()]',
+            '(//span[@class="btn"])[1]',
+            '(/html/body/div)[position()=1]'
+        ]
+        for expr in expressions:
+            assert FindElementsMixin._get_expression_type(expr) == By.XPATH
+
 
 class TestEnsureRelativeXPath:
     """Test the _ensure_relative_xpath static method."""