test: prove TechLog UI migration parity

tests/unit/design-system-source.test.ts

@@ -0,0 +1,15 @@
+import { describe, expect, it } from "vitest";
+
+import { containsRawPaletteValue } from "../../scripts/lib/design-system-source.ts";
+
+describe("design-system source palette detection", () => {
+  it("rejects palette literals without treating URL fragments as colors", () => {
+    expect(containsRawPaletteValue('style={{ color: "#ff0000" }}')).toBe(true);
+    expect(containsRawPaletteValue('const css = "color: rgb(255 0 0)"')).toBe(true);
+    expect(
+      containsRawPaletteValue(
+        'path: "/projects/backend-skeleton/decisions#feed-pagination-boundary"',
+      ),
+    ).toBe(false);
+  });
+});