#470 Restore pyplot getter semantics for limits and ticks

Fixes #443

Summary

• Restore Matplotlib-style getters and setters for xlim/ylim, including xmin/xmax and ymin/ymax aliases.
• Make xticks/yticks return locations and label handles for reads and writes, with minor reads/results following the requested minor axis.
• Preserve live Legend handles in the pyplot API and correct the Axes return annotations.
• Document the compatibility contract and add a bugfix news fragment.
• Merge current upstream main.

Validation

• Focused pyplot getter, resize, shared-panel sizing, inset/free-form/twin-axis, and limit-conflict regressions — 6 passed.
• Full pyplot suite — 1,119 passed, 100 skipped; one unrelated pandas plotting test could not run because optional Matplotlib is not installed in this environment.
• ty check python/xy/pyplot/_axes.py, Ruff check/format, and git diff --check — passed.
• Pinned reflex-release changelog check, heading check, and generated workflow sync passed on the previous validation pass.
• The generated JS bundle and Rust release build both completed locally.

Summary by CodeRabbit

Summary by CodeRabbit

• New Features

  • Plot limit controls return current or updated axis limits and accept xmin/xmax and ymin/ymax aliases.
  • Tick controls return tick locations and label handles. Calls without tick-setting arguments retrieve major ticks by default, or minor ticks with minor=True.
  • Legend creation returns a live legend handle.

• Bug Fixes

  • Getter and setter results reflect the requested plotting operation.
  • Minor tick queries report locations consistent with the rendered plot, including after figure resizing.
  • Conflicting limit aliases and endpoint arguments are rejected.