feat(ui): Implement Subtle Rounding professional theme

tests/test_theme.py

@@ -0,0 +1,35 @@
+import pytest
+from unittest.mock import MagicMock
+from src import theme_2 as theme
+
+def test_theme_apply_sets_rounding_and_padding(monkeypatch):
+    # Mock imgui
+    mock_style = MagicMock()
+    mock_imgui = MagicMock()
+    mock_imgui.get_style.return_value = mock_style
+    mock_imgui.ImVec2.side_effect = lambda x, y: (x, y)
+    monkeypatch.setattr(theme, "imgui", mock_imgui)
+
+    # Call apply with the default palette
+    theme.apply("ImGui Dark")
+
+    # Verify subtle rounding styles
+    assert mock_style.window_rounding == 6.0
+    assert mock_style.child_rounding == 4.0
+    assert mock_style.frame_rounding == 4.0
+    assert mock_style.popup_rounding == 4.0
+    assert mock_style.scrollbar_rounding == 12.0
+    assert mock_style.grab_rounding == 4.0
+    assert mock_style.tab_rounding == 4.0
+
+    # Verify borders
+    assert mock_style.window_border_size == 1.0
+    assert mock_style.frame_border_size == 1.0
+    assert mock_style.popup_border_size == 1.0
+
+    # Verify padding/spacing
+    assert mock_style.window_padding == (8.0, 8.0)
+    assert mock_style.frame_padding == (8.0, 4.0)
+    assert mock_style.item_spacing == (8.0, 4.0)
+    assert mock_style.item_inner_spacing == (4.0, 4.0)
+    assert mock_style.scrollbar_size == 14.0