feat(theme): the creation screen's five variations

SelectCard (a Button whose `pressed` IS the chosen ring), SkillChip (a toggle
with unpicked/picked/granted-so-inert), the CHOSEN and PRIMARY tags, and the
gold PrimaryCard ring. Plus INK_LABEL_MUTED for the sheet's section headers.

Built by build_game_theme.gd and regenerated; the .tres is never hand-edited.

client/scripts/theme/palette.gd

@@ -43,6 +43,7 @@ const INK_BODY := Color("4a3f2c")
 const INK_MUTED := Color("6a5a3a")
 const INK_LABEL := Color("5a4326")
 const INK_GOLD := Color("8f6a2a")
+const INK_LABEL_MUTED := Color("8a7748")   # section labels on parchment (creation sheet)
 
 # --- Text on dark ---
 const CREAM := Color("e8ddc8")