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.

api/internal/httpapi/ws.go

@@ -3,7 +3,7 @@
 // Scope: push JSON snapshots to subscribed clients. We never expect
 // client payloads larger than a ping/pong and we don't negotiate
 // extensions (compression, fragmentation). Anything fancier is out of
-// scope for Phase 2b — upgrade to a real ws library once we can run
+// scope for Phase 2b, upgrade to a real ws library once we can run
 // `go mod tidy` in a real build environment.
 package httpapi