Thousands of people crowded a neighborhood on Moscow’s outskirts on Friday — some bearing flowers and chanting‚ “No to war!” — as they tried to catch a glimpse of the funeral for Aleksei A. Navalny. The outpouring turned the opposition leader’s last rites into a striking display of dissent in Russia at a time of deep repression. The service took place under tight monitoring from the Russian authorities‚ who have arrested hundreds of mourners at memorial sites since Mr. Navalny died...