feat(gui): Remove Context Presets tab from Project Settings

Context Presets tab removed from Project Settings panel.
The _render_context_presets_panel method call is removed from the tab bar.
Context presets functionality will be re-introduced in Discussion Hub -> Context Composition tab.

tests/test_context_presets_removal.py

@@ -0,0 +1,14 @@
+import pytest
+import inspect
+
+
+def test_context_presets_tab_removed_from_project_settings():
+    import src.gui_2 as gui_2
+
+    source = inspect.getsource(gui_2.App._gui_func)
+    assert "Context Presets" not in source, (
+        "Context Presets tab should be removed from Project Settings"
+    )
+    assert "_render_context_presets_panel" not in source, (
+        "Context presets panel call should be removed"
+    )