Use one button style and an icon-only dock

Buttons no longer have a primary style: every button is the translucent
outlined surface that brightens on hover, and only an icon button's icon
takes the accent color. The title screen's dock shows just its icons.

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

src/main/java/org/saturnclient/ui/screens/ShiftMenu.java

@@ -44,7 +44,7 @@ public class ShiftMenu extends SaturnScreen {
                 .position(x, 0).animation(new Fade(AnimationConfig.shiftMenu)));
         x += Button.HEIGHT + GAP;
 
-        stagger.draw(new Button("Mods", true, () -> Providers.saturn.getClient().setScreen(new ModMenu()))
+        stagger.draw(new Button("Mods", () -> Providers.saturn.getClient().setScreen(new ModMenu()))
                 .dimensions(MODS_WIDTH, Button.HEIGHT)
                 .position(x, 0).animation(new Fade(AnimationConfig.shiftMenu)));
         x += MODS_WIDTH + GAP;