client: pdf-gen: add legend graphic * Add a plain legend graphic to the right upper corner. Take a detour via a HTMLImageElement to get the aspect ration of the legend graphic and calculate the necessary size accordingly.

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

# backend binary
cmd/gemma/gemma

# Dependency directories
**/node_modules

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

# Tags tables
**/TAGS