Edge render (solid/dashed/dotted) and stroke width were hardcoded per
edge type. Expose both as user settings.
- Custom Style modal (Edges): line-style buttons, 1-4x width slider,
live preview; left-list swatch renders the actual line.
- Per-edge EdgeModal: same controls; line style follows the type preset
live until overridden.
- Renderer applies line_style/width_mult over BASE_STYLES (width scales
markers + animation overlays); unset keeps the type default look.
- Persist line_style/width_mult through serializer, canvas save, and the
edges API (new nullable columns, idempotent migration).
ha-relevant: yes
Pouzor