Feature plot metrics

[dgenak]

Enhanced plot_xy metrics visualization

• Changed r2_score to flexible metrics dictionary
• Added interactive metrics display above plot
• Updated tests for new metrics functionality

[dgenak]

"Hi! This is our solution for issue #927 - 'Update plot to display any evaluation metric'.
We updated plot_xy in autoemulate/core/plotting.py to accept a metrics dictionary (dict[str, float] | None) instead of a single r2_score. We also added a helper function _add_metrics_box that renders the metrics as clickable boxes above the plot — clicking a box toggles between the metric name and its value.
On the testing side, we updated the existing test_plot_xy and added test_plot_xy_without_metrics to cover the case where no metrics are passed. All tests pass."

[radka-j]

Hi @dgenak! Thank you for opening this PR, we really appreciate it. I will try to review this as soon as possible. In the meantime, could you please address the pre-commit issues? If you are unfamiliar with pre-commit, we have instructions in our docs. Please also feel free to ask for help here :)

[dgenak]

Hi! We ran pre-commit and ruff passed successfully. The only failure was pyright, which is reporting an error in autoemulate/calibration/base.py (lines 143 and 177), a file we didn't modify as part of this PR, so it seems to be a pre-existing issue. Let us know if you'd like us to fix it anyway!

[radka-j]

Hi @dgenak! If you look at the output of the pre-commit run in the CI here there are issues raised in the new plotting functionality and also in compare because of the changes made here.