feat(sdm): inject structural dependency mapping tags across codebase

Adds [C: caller] tags to functions/methods and [M: mutation] / [U: usage] tags to class variables based on cross-module call analysis.

tests/test_gui_text_viewer.py

@@ -5,7 +5,8 @@ from src.api_hook_client import ApiHookClient
 def test_text_viewer_state_update(live_gui) -> None:
  """
  
-  Verifies that we can set text viewer state and it is reflected in GUI state.
+  
+   Verifies that we can set text viewer state and it is reflected in GUI state.
  """
  client = ApiHookClient()
  client.click("btn_reset")
@@ -32,4 +33,4 @@ def test_text_viewer_state_update(live_gui) -> None:
  assert state is not None
  assert state.get('show_text_viewer') == True
  assert state.get('text_viewer_title') == label
- assert state.get('text_viewer_type') == text_type
+ assert state.get('text_viewer_type') == text_type