Generic canvas events (WIP)

[gselzer]

Adds KeyPressEvent and KeyReleaseEvent with the goal of enabling keyboard shortcuts in downstream tools such as ndv.

Key events are modeled using app-model's KeyBinding type. Longer-term, we should consider upstreaming pieces of the events system to app-model.

This PR also makes some minor refactors to the events model (e.g. renaming canvas_pos → pos, world_ray removed from MouseEvent base) in the pursuit of more general events that can be used by Canvas event filters now and maybe upstream in app-model later.

What's included

• KeyPressEvent and KeyReleaseEvent event types
• Qt backend support for keyboard events
• Example: keyboard_pan_zoom.py

TODO

• Consider adding keyboard shortcuts directly into CameraControllers
• Jupyter backend keyboard events
• Wx backend keyboard events

[codecov]

Codecov Report

❌ Patch coverage is 75.49020% with 25 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.74%. Comparing base (d8da025) to head (e74145c).

Files with missing lines	Patch %	Lines
src/scenex/model/_canvas.py	53.57%	13 Missing ⚠️
src/scenex/app/_jupyter.py	0.00%	6 Missing ⚠️
src/scenex/model/_nodes/camera.py	87.87%	4 Missing ⚠️
src/scenex/app/_wx.py	92.30%	1 Missing ⚠️
src/scenex/imgui/_controls.py	0.00%	1 Missing ⚠️

❌ Your patch check has failed because the patch coverage (75.49%) is below the target coverage (85.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #61      +/-   ##
==========================================
- Coverage   88.13%   84.74%   -3.39%     
==========================================
  Files          62       62              
  Lines        2950     2977      +27     
==========================================
- Hits         2600     2523      -77     
- Misses        350      454     +104     

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