feat(gui): Refactor text viewer to use rich rendering and toolbar

tests/test_gui_text_viewer.py

@@ -0,0 +1,28 @@
+import pytest
+import time
+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.
+ """
+ client = ApiHookClient()
+ label = "Test Viewer Label"
+ content = "This is test content for the viewer."
+ text_type = "markdown"
+
+ # Add a task to push a custom callback that mutates the app state
+ def set_viewer_state(app):
+  app.show_text_viewer = True
+  app.text_viewer_title = label
+  app.text_viewer_content = content
+  app.text_viewer_type = text_type
+
+ client.push_event("custom_callback", {"callback": set_viewer_state})
+ time.sleep(0.5)
+ 
+ state = client.get_gui_state()
+ 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