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>
   )

apps/web/src/lib/build-info.ts

@@ -0,0 +1,21 @@
+const FALLBACK_VERSION = "0.0.1-dev"
+const FALLBACK_SHA = "local"
+
+function shortenSha(input: string): string {
+  const value = input.trim()
+  if (!value) {
+    return FALLBACK_SHA
+  }
+
+  return value.slice(0, 7)
+}
+
+export function getBuildInfo() {
+  const version = process.env.NEXT_PUBLIC_APP_VERSION?.trim() || FALLBACK_VERSION
+  const sha = shortenSha(process.env.NEXT_PUBLIC_GIT_SHA ?? "")
+
+  return {
+    version,
+    sha,
+  }
+}