Line stroke defaults

[erikgaas]

Fixes #757

Line defaults suppressed inheriting of stroke color from parent elements.

[gitnotebooks]

Found 2 changed notebooks. Review the changes at https://app.gitnotebooks.com/AnswerDotAI/fasthtml/pull/804

[jph00]

Can you check this still seems to work ok?:
https://github.com/AnswerDotAI/fasthtml-example/blob/main/htmx/svgswap.py

And also that the docs render ok?:
https://www.fastht.ml/docs/api/svg.html

[erikgaas]

Can you check this still seems to work ok?: https://github.com/AnswerDotAI/fasthtml-example/blob/main/htmx/svgswap.py

And also that the docs render ok?: https://www.fastht.ml/docs/api/svg.html

Both seem to work fine.