Firefighters are making progress on containing the wildfires that have been raging for weeks in Southern California. But even once the physical threat of the fires diminishes, the mental-health toll will linger for months and even years, experts say. With thousands of people evacuated and homes destroyed, rebuilding people’s social and psychological resources is one of the next pressing challenges. Mental-health crisis centers are already seeing a surge in wildfire-related calls from the Los Angeles area.