feat: unify design tokens, five font weights, radius scale, restrained motion, AA contrast

frontend/vitest.setup.ts

@@ -0,0 +1,11 @@
+// Synchronous requestAnimationFrame so Vue <Transition> leave (double-rAF)
+// settles in the same tick as close(), preserving tests' "dialog removed
+// immediately" contract. Production keeps real browser frames.
+globalThis.requestAnimationFrame = ((cb: FrameRequestCallback) => {
+  cb(Date.now())
+  return 1
+}) as typeof globalThis.requestAnimationFrame
+
+globalThis.cancelAnimationFrame = (() => {}) as typeof globalThis.cancelAnimationFrame
+
+export {}