Clarification: exporting only the last Live frame via save_svg

[troysis]

Hi Rich team,

Issue #3813 requests a way for Console.save_svg() to capture only the final frame of a Live session. The current recorder writes every intermediate refresh, so SVG exports can balloon into multi-frame animations even when users only need the last state (e.g., to include a dashboard snapshot in a paper).

I prototyped a branch (troysis/rich → save-live-final-frame) that replays the recorded segments to compute the final frame before exporting, exposed via a final_only kwarg. Before I open a PR, I wanted to confirm whether you’d treat this as (a) a bug fix / extensibility hook, or (b) a “new feature” that falls outside the current contribution policy.

Questions:

1. Would adding a hook (e.g., exposing the replay helper but leaving saving behavior unchanged) be preferable?
2. Is there an existing extension point I should use instead?

Happy to iterate however best fits the project. Thanks for the guidance!