feat(pwa): add web share target for text and images with offline queue

internal/api/server.go

@@ -308,6 +308,11 @@ func (s *Server) Router() http.Handler {
 		})
 	})
 
+	// Web Share Target fallback when service worker is not active yet: redirect to /
+	r.Post("/share-target", func(w http.ResponseWriter, r *http.Request) {
+		http.Redirect(w, r, "/", http.StatusSeeOther)
+	})
+
 	// Embedded Frontend SPA Handler
 	if s.staticFS != nil {
 		fileServer := http.FileServer(http.FS(s.staticFS))