Add share cards

api/internal/webui/embed.go

@@ -9,7 +9,7 @@
 //     inside the image build.
 //
 // A placeholder index.html is committed so `go build` succeeds on a
-// fresh checkout without anyone having run `make ui` — it just shows
+// fresh checkout without anyone having run `make ui`, it just shows
 // a "UI not built" notice instead of the real dashboard.
 package webui