Add named_style_type support to update_paragraph_style operation

Allows setting TITLE and SUBTITLE paragraph styles directly, in addition
to the existing heading_level (0-6) parameter. The new named_style_type
parameter accepts all Google Docs named styles: NORMAL_TEXT, TITLE,
SUBTITLE, HEADING_1 through HEADING_6.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

gdocs/managers/batch_operation_manager.py

@@ -244,6 +244,7 @@ class BatchOperationManager:
                 op.get("space_above"),
                 op.get("space_below"),
                 tab_id,
+                op.get("named_style_type"),
             )
 
             if not request: