client: correct refresh layers request time * make a variable "refreshLayersTime" to track the time used in the refreshLayers request, to avoid using old value as long as "currentVisibleTime" gets its value after the refreshLayers request is ended, which was leading to show time in toolbar does not actually match the time in the layers reload request.

# documentation
**/README*
**/docs
**/*.md

# backend binary
cmd/gemma/gemma

# Dependency directories
.buildbase
**/node_modules

# local dotenv environment variables file
client/.env.local

# Tags tables
**/TAGS