feat(theme): palette tokens as the single colour source

client/tests/unit/test_palette.gd

@@ -0,0 +1,45 @@
+extends "res://addons/gut/test.gd"
+
+const Palette = preload("res://scripts/theme/palette.gd")
+
+
+func test_core_tokens_are_colors():
+	assert_true(Palette.BLOOD is Color)
+	assert_true(Palette.GOLD is Color)
+	assert_true(Palette.PARCHMENT_CARD is Color)
+	assert_true(Palette.CREAM is Color)
+
+
+func test_blood_core_matches_readme_hex():
+	# #8f3a34 — the primary CTA / danger / selection red.
+	assert_eq(Palette.BLOOD, Color("8f3a34"))
+
+
+func test_dark_panel_is_translucent():
+	assert_almost_eq(Palette.DARK_PANEL_70.a, 0.7, 0.01)
+
+
+func test_rarity_ladder_has_five_ordered_colors():
+	assert_eq(Palette.RARITY.size(), 5)
+	assert_eq(Palette.rarity_color(0), Color("8a8378"))   # common
+	assert_eq(Palette.rarity_color(4), Color("c8963f"))   # legendary
+
+
+func test_rarity_color_clamps_out_of_range():
+	# Out-of-range must NOT index-error (would emit an engine error -> fail).
+	assert_eq(Palette.rarity_color(-3), Palette.RARITY[0])
+	assert_eq(Palette.rarity_color(99), Palette.RARITY[4])
+
+
+func test_stat_bar_returns_from_to_pair():
+	var hp = Palette.stat_bar(&"hp")
+	assert_eq(hp.size(), 2)
+	assert_eq(hp[0], Color("b8524a"))
+	assert_eq(hp[1], Color("8f3a34"))
+
+
+func test_stat_bar_unknown_kind_is_safe():
+	# Unknown kind returns a grey pair, never null / error.
+	var pair = Palette.stat_bar(&"nonsense")
+	assert_eq(pair.size(), 2)
+	assert_true(pair[0] is Color)