Sync _legend_dict on legend location change

[cvanelteren]

An issue popped up in #309 where if locations are changed for legends they are not synced with _legend_dict. This PR fixes this by override the set_loc function of legend.

Why was this an issue? UltraPlot allows for updating the styling of legends when a legend already exists on at that location. Since the internal reference is used, a sync issue appears if for whatever reason the legend is moved.

[cvanelteren]

needs tests

[Copilot]

Pull Request Overview

This PR fixes a synchronization issue where _legend_dict becomes out of sync when legend locations are changed after creation. The fix involves creating a custom Legend class that overrides the set_loc method to update the internal dictionary when the location changes.

• Creates a custom Legend wrapper class that inherits from matplotlib's Legend
• Overrides the set_loc method to sync location changes with _legend_dict
• Updates all references throughout the codebase to use the new custom Legend class

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
ultraplot/legend.py	Introduces new Legend class with overridden set_loc method for syncing location changes
ultraplot/axes/base.py	Updates imports and references to use the custom Legend class instead of matplotlib's Legend

Comments suppressed due to low confidence (1)

ultraplot/legend.py:33

• The variable name type shadows the built-in type function. Consider renaming it to legend_type or similar.

            where, type = old_loc

[codecov]

Codecov Report

❌ Patch coverage is 94.59459% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
ultraplot/legend.py	90.47%	0 Missing and 2 partials ⚠️

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