feat(versioning): show runtime version and git hash in app footers

apps/web/src/components/public-site-footer.tsx

@@ -2,9 +2,12 @@
 
 import { useTranslations } from "next-intl"
 
+import { getBuildInfo } from "@/lib/build-info"
+
 export function PublicSiteFooter() {
   const t = useTranslations("Layout")
   const year = new Date().getFullYear()
+  const buildInfo = getBuildInfo()
 
   return (
     <footer className="border-t border-neutral-200 bg-neutral-50">
@@ -15,6 +18,9 @@ export function PublicSiteFooter() {
           })}
         </p>
         <p>{t("footer.tagline")}</p>
+        <p className="font-mono text-xs text-neutral-500">
+          Build v{buildInfo.version} +sha.{buildInfo.sha}
+        </p>
       </div>
     </footer>
   )