Propagate settings tooltips to tree rows

[kmnhan]

Summary

• Propagate ParameterTree tooltip metadata onto both columns and the row widgets in the settings dialog.
• Add a Qt test that verifies tooltip metadata reaches the label and value widgets for a known option.

Testing

• Unit/UI tests added for tooltip propagation in the options dialog.
• Existing options tree tests continue to pass.

[codecov]

Codecov Report

❌ Patch coverage is 92.85714% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 88.90%. Comparing base (0ba5d50) to head (ebbc494).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/erlab/interactive/_options/ui.py	92.85%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #379   +/-   ##
=======================================
  Coverage   88.90%   88.90%           
=======================================
  Files         139      139           
  Lines       47200    47214   +14     
  Branches     7617     7623    +6     
=======================================
+ Hits        41961    41974   +13     
  Misses       3265     3265           
- Partials     1974     1975    +1     

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