fix(android): the Copy buttons were ellipses, not pills

A fixed radius of 26 on a button only 40 tall makes the corners meet, and the shape stops being a rounded rectangle at all. The radius is now recomputed from the height whenever it changes - the height is set after creation, which is why a constant could never be right.

And the small row buttons take a moderate radius rather than the full pill: they are low and wide, and a stadium shape read as an oval. The fully rounded form stays where the reference puts it, on the main actions.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

mainApk.pas

@@ -571,6 +571,9 @@ begin
   Result.Margins.Rect := RectF(8, 6, 0, 6);
   Result.Width := 96;
   Result.Tag := ATag;
+  // Arrondi modere : ces boutons sont bas et larges, une pilule les rendait
+  // ovales. La forme pleinement arrondie reste aux actions principales.
+  SetCornerRadius(Result, 14);
 end;
 
 procedure TForm8.BuildDetail;