Small stroke width lines are difficult to read

[sapphire-arches]

Is your feature request related to a problem? Please describe.
When loading files that include unfilled zones on the User.* layers, the line work can be difficult to read if the stroke width is very small.

Example file: https://kicanvas.org/?github=https%3A%2F%2Fgithub.com%2FGlasgowEmbedded%2Fglasgow%2Fblob%2F5cb023ee61cb5d3b05b2662aef9ee25edb6dfabe%2Fhardware%2Fboards%2Fglasgow%2Fglasgow.kicad_pcb

Problematic line s-expr:

  (gr_line (start 126 69) (end 54 69)
    (stroke (width 0.01) (type solid)) (layer "User.1") (tstamp 0d817c2c-d13a-4a6c-92e5-a11fa265616e))

Describe the solution you'd like
Line width should be clamped to a (user controllable?) minimum of at least a few pixels.

Describe alternatives you've considered

• Leave the current behavior, as it is technically correct (the relevant lines do indeed specify a minuscule line width)
• Adjust color scheme so the lines are higher contrast, even if they are only 1 pixel wide.

Additional context