Release 0.2.0: device-aware controls, spear, settings, shaders

Show touch controls only on touch platforms and keyboard hints only on
desktop, via a shared Controls.use_touch_ui() gate (is_touchscreen_available
is unreliable with emulate_touch_from_mouse). Bumps version to 0.2.0.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

ui_theme.gd

@@ -21,15 +21,15 @@ const SHADOW       := Color(0.00, 0.00, 0.00, 0.55)
 ## HUD tiles or CREAM for a hot/hover state; a transparent accent draws a frameless
 ## plate (still shadowed).
 static func plaque(bg: Color, accent: Color = BORDER,
-		corner: int = 3, h_margin: float = 16.0, v_margin: float = 8.0,
+		corner: int = 1, h_margin: float = 16.0, v_margin: float = 8.0,
 		shadow: bool = true) -> StyleBoxFlat:
 	var s := StyleBoxFlat.new()
 	s.bg_color = bg
 	s.set_corner_radius_all(corner)
-	s.corner_detail = 6
+	s.corner_detail = 1
 	if accent.a > 0.0:
-		s.set_border_width_all(2)
-		s.border_width_bottom = 5
+		s.set_border_width_all(1)
+		s.border_width_bottom = 2
 		s.border_color = accent
 	s.content_margin_left   = h_margin
 	s.content_margin_right  = h_margin