feat(ui): Implement Subtle Rounding professional theme

src/theme_2.py

@@ -204,18 +204,39 @@ def get_current_scale() -> float:
 
 def apply(palette_name: str) -> None:
  """
-    Apply a named palette by setting all ImGui style colors.
+    Apply a named palette by setting all ImGui style colors and applying global professional styling.
     Call this once per frame if you want dynamic switching, or once at startup.
     In practice we call it once when the user picks a palette, and imgui retains the style.
     """
  global _current_palette
  _current_palette = palette_name
  colours = _PALETTES.get(palette_name, {})
+ style = imgui.get_style()
+
+ # Subtle Rounding Professional Theme
+ style.window_rounding = 6.0
+ style.child_rounding = 4.0
+ style.frame_rounding = 4.0
+ style.popup_rounding = 4.0
+ style.scrollbar_rounding = 12.0
+ style.grab_rounding = 4.0
+ style.tab_rounding = 4.0
+ style.window_border_size = 1.0
+ style.frame_border_size = 1.0
+ style.popup_border_size = 1.0
+ 
+ # Spacing & Padding
+ style.window_padding = imgui.ImVec2(8.0, 8.0)
+ style.frame_padding = imgui.ImVec2(8.0, 4.0)
+ style.item_spacing = imgui.ImVec2(8.0, 4.0)
+ style.item_inner_spacing = imgui.ImVec2(4.0, 4.0)
+ style.scrollbar_size = 14.0
+
  if not colours:
- # Reset to imgui dark defaults
+  # Reset to imgui dark defaults
   imgui.style_colors_dark()
   return
- style = imgui.get_style()
+
  # Start from dark defaults so unlisted keys have sensible values
  imgui.style_colors_dark()
  for col_enum, rgba in colours.items():