Add share cards

api/internal/httpapi/server.go

@@ -59,7 +59,7 @@ func (s *Server) Handler() http.Handler {
 func spaHandler(root fs.FS) http.Handler {
 	fileServer := http.FileServerFS(root)
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		// Defence-in-depth — /api routes are matched by the mux first
+		// Defence-in-depth, /api routes are matched by the mux first
 		// with their GET patterns, but a bare POST /api/... would fall
 		// through here. Return 404 so we don't accidentally shadow
 		// API semantics with HTML.