Fix AutoLoopCalculatorTTSBatch data type bug for downstream TTS nodes

- Removed `INPUT_IS_LIST = True` to prevent ComfyUI from implicitly converting input values to lists and expecting lists as outputs.
- Refactored `calculate` to handle list inputs natively using `isinstance` while correctly interacting with the standard Text Reader's native Python lists.
- Changed the return signature to emit native primitive values (`str`, `int`) instead of wrapping them in lists, correctly accommodating downstream integration with TTS models (e.g. Fish Speech) that expect pure strings.

test_loop_syntax.py

@@ -0,0 +1,26 @@
+import sys
+from unittest.mock import MagicMock
+
+sys.modules['torch'] = MagicMock()
+sys.modules['comfy'] = MagicMock()
+sys.modules['comfy.model_management'] = MagicMock()
+
+# Mocking relative import
+class MockRegisterNode:
+    def __call__(self, cls):
+        return cls
+
+import builtins
+real_import = builtins.__import__
+
+def mocked_import(name, globals=None, locals=None, fromlist=(), level=0):
+    if name == '' and level > 0 and 'register_node' in fromlist:
+        mock_module = MagicMock()
+        mock_module.register_node = MockRegisterNode()
+        return mock_module
+    return real_import(name, globals, locals, fromlist, level)
+
+builtins.__import__ = mocked_import
+
+import loop
+print("Sintaxis de loop.py verificada correctamente.")