feat: add overlap/acq mode to StageExplorer

[fdrgsp]

MERGE AFTER #462

Add grid overlap and acquisition order to scan menu of StageExplorer

Screen.Recording.2025-08-14.at.4.01.11.PM.mov

[codecov]

Codecov Report

❌ Patch coverage is 55.00000% with 36 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.67%. Comparing base (aa37fca) to head (64b8878).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...widgets/control/_stage_explorer/_stage_explorer.py	69.81%	16 Missing ⚠️
src/pymmcore_widgets/control/_rois/roi_model.py	22.22%	7 Missing ⚠️
src/pymmcore_widgets/control/_rois/roi_manager.py	25.00%	6 Missing ⚠️
src/pymmcore_widgets/control/_rois/_vispy.py	0.00%	4 Missing ⚠️
src/pymmcore_widgets/control/_rois/q_roi_model.py	25.00%	3 Missing ⚠️

❌ Your patch check has failed because the patch coverage (55.00%) 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     #461      +/-   ##
==========================================
- Coverage   87.82%   87.67%   -0.16%     
==========================================
  Files         105      105              
  Lines       11555    11615      +60     
==========================================
+ Hits        10148    10183      +35     
- Misses       1407     1432      +25     

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