feat: add privacy, terms, and cookies pages

Footer and login legal links were stubs. Point them at real marketing
pages that follow the Figma content-page template.

messages/en/components/footer.json

@@ -28,13 +28,12 @@
     "about": "About"
   },
   "legal": {
-    "_comment": "privacyPolicyHref, termsOfServiceHref, cookiesSettingsHref are stubs until legal pages ship.",
     "privacyPolicy": "Privacy Policy",
-    "privacyPolicyHref": "#",
+    "privacyPolicyHref": "/privacy",
     "termsOfService": "Terms of Service",
-    "termsOfServiceHref": "#",
+    "termsOfServiceHref": "/terms",
     "cookiesSettings": "Cookies Settings",
-    "cookiesSettingsHref": "#"
+    "cookiesSettingsHref": "/cookies"
   },
   "license": {
     "_comment": "Replaces Figma's '© All right reserved'. Covers user-facing content (guides, template copy, marketing) per README — not GPL-3.0 application source. Published user-authored rules are a separate grant.",