fix(ui): improve financial text contrast

TD-010: use readable semantic text colors on financial surfaces while preserving signs
and state meanings.

src/shared/theme/contrast.test.ts

@@ -0,0 +1,45 @@
+import { describe, expect, it } from "vitest";
+import tokens from "./tokens.json";
+
+function luminance(color: string) {
+	const channels = [1, 3, 5]
+		.map((index) => Number.parseInt(color.slice(index, index + 2), 16) / 255)
+		.map((value) =>
+			value <= 0.04045 ? value / 12.92 : ((value + 0.055) / 1.055) ** 2.4,
+		);
+	return channels[0] * 0.2126 + channels[1] * 0.7152 + channels[2] * 0.0722;
+}
+describe("financial text contrast", () => {
+	it.each(["positive", "negative"] as const)(
+		"keeps %s readable on journal, position and tinted card surfaces",
+		(tone) => {
+			const role = tokens.color.roles[tone];
+			const palettes = tokens.color.palettes;
+			const foreground =
+				palettes[role.color as keyof typeof palettes][role.shade];
+			const surfaces = [
+				palettes.gray[0],
+				...Object.entries(palettes)
+					.filter(([name]) => name !== "dark")
+					.map(
+						([, palette]) =>
+							`#${[1, 3, 5]
+								.map((index) =>
+									Math.round(
+										Number.parseInt(palette[0].slice(index, index + 2), 16) *
+											0.45 +
+											255 * 0.55,
+									)
+										.toString(16)
+										.padStart(2, "0"),
+								)
+								.join("")}`,
+					),
+			];
+			for (const background of surfaces)
+				expect(
+					(luminance(background) + 0.05) / (luminance(foreground) + 0.05),
+				).toBeGreaterThanOrEqual(4.5);
+		},
+	);
+});

src/shared/theme/tokens.json

@@ -53,7 +53,7 @@
 				"#40c057",
 				"#37b24d",
 				"#2f9e44",
-				"#2b8a3e"
+				"#237032"
 			],
 			"red": [
 				"#fff5f5",
@@ -151,12 +151,12 @@
 			},
 			"positive": {
 				"color": "green",
-				"shade": 6,
+				"shade": 9,
 				"description": "Положительный результат; дополните знаком и текстом"
 			},
 			"negative": {
 				"color": "red",
-				"shade": 6,
+				"shade": 9,
 				"description": "Ошибка / отрицательный результат; дополните текстом"
 			},
 			"warning": {

src/shared/ui/EntryCard.module.css

@@ -19,15 +19,15 @@
 }
 
 .positive {
-	color: var(--mantine-color-green-6);
+	color: var(--wl-color-positive);
 }
 
 .negative {
-	color: var(--mantine-color-red-6);
+	color: var(--wl-color-negative);
 }
 
 .neutral {
-	color: var(--mantine-color-dimmed);
+	color: var(--mantine-color-gray-7);
 }
 
 @media (max-width: 36em) {