docs(CLAUDE.md): add code style section aligned with glyphdiff conventions

vitest.config.ts

@@ -0,0 +1,24 @@
+import path from "node:path";
+import { svelte } from "@sveltejs/vite-plugin-svelte";
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+	plugins: [svelte({ hot: !process.env.VITEST })],
+	test: {
+		globals: true,
+		environment: "jsdom",
+		setupFiles: ["./src/tests/setup.ts"],
+		include: ["src/**/*.{test,spec}.{js,ts}"],
+		exclude: ["src/tests/e2e/**/*.{test,spec}.{js,ts}"],
+	},
+	resolve: {
+		alias: {
+			$lib: path.resolve("./src/lib"),
+			$shared: path.resolve("./src/shared"),
+			$pages: path.resolve("./src/pages"),
+			$features: path.resolve("./src/features"),
+			$entities: path.resolve("./src/entities"),
+			$widgets: path.resolve("./src/widgets"),
+		},
+	},
+});