client: pdf-gen: make scalebar box size dynamic * Change the calculation of the size of the scalebar to use a fixed maximum size and draw the box around it, when the size has been cacalculated. Use a fixed placement in the lower right corner for now.

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

# backend binary
cmd/gemma/gemma

# Dependency directories
**/node_modules

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

# Tags tables
**/TAGS