test: vitest unit + playwright e2e suites; fix a11y, contrast, no-JS reveal

- vitest: dictionary parity, slug-map bijection, content-schema validation, JSON-LD (23)
- playwright: both locales, language-switch mapping (incl. no-JS), CV downloads,
  form happy-path + honeypot, axe a11y on 5 templates x 2 themes (23)
- fix: raise ink-faint + light accent to meet WCAG AA 4.5:1 (axe-verified)
- fix: gate reveal animations behind html.js so content is visible without JS
  (progressive enhancement - was hidden at opacity 0); scan reduced-motion path
- fix: validate contact form before the anti-bot time-trap (no false success)
- chore: ESLint node globals, typed diagram props, resvg fontFiles, prettier pass

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

site/vitest.config.ts

@@ -0,0 +1,22 @@
+import { defineConfig } from 'vitest/config';
+import { fileURLToPath } from 'node:url';
+
+const r = (p: string) => fileURLToPath(new URL(p, import.meta.url));
+
+export default defineConfig({
+  resolve: {
+    alias: {
+      '@': r('./src'),
+      '@i18n': r('./src/i18n'),
+      '@lib': r('./src/lib'),
+      '@components': r('./src/components'),
+      '@layouts': r('./src/layouts'),
+      '@styles': r('./src/styles'),
+      '@scripts': r('./src/scripts'),
+    },
+  },
+  test: {
+    environment: 'node',
+    include: ['test/**/*.test.ts'],
+  },
+});