Redesign client settings

ClientSettings replaces ConfigEditor: a section list on the left (General,
UI Style, Animations) and the chosen section's settings on the right, each
with a Reset for that section. UI Style shows four theme presets, the
theme colors as a two-column grid, then the radii and font.

New pieces: SectionNav, ThemePresetCard, ColorGrid and Theme.PRESETS.
Theme keeps its config like AnimationConfig does, Divider can be vertical,
and PropertyList's section titles are public.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/main/java/org/saturnclient/ui/elements/Divider.java

@@ -6,7 +6,8 @@ import org.saturnclient.ui.ElementContext;
 import org.saturnclient.ui.RenderScope;
 
 /**
- * A faint horizontal line across the element's width.
+ * A faint line filling the element: horizontal by default, or vertical when
+ * given a width of 1 and a height.
  */
 public class Divider extends Element {
 
@@ -17,6 +18,6 @@ public class Divider extends Element {
 
     @Override
     public void render(RenderScope renderScope, ElementContext ctx) {
-        renderScope.drawRectangle(0, 0, width, 1, Theme.getBorder());
+        renderScope.drawRectangle(0, 0, width, height, Theme.getBorder());
     }
 }