fix(interactive): infer KTool guideline delta sign

[kmnhan]

Summary

• Infer a guideline-derived delta sign from the axes configuration and displayed axis order.
• Use rotation guidelines only when the first two displayed axes are alpha and beta, in either order.
• Apply a configuration selected in the KTool prompt without changing explicit initial_delta values.
• Keep the source data unchanged when configuration is selected or the prompt is canceled.

Root cause

ImageTool guideline angles follow display-axis direction. KTool delta follows an axes-configuration convention. The previous handoff always negated the guideline angle before a missing configuration was resolved. Type 2 configurations and reversed alpha-beta display order could therefore produce the wrong sign.

Validation

• uv run pytest tests/interactive/test_kspace.py - 137 passed with PyQt6.
• uv run pytest tests/interactive/imagetool/test_imagetool.py -k 'open_in_ktool' - 7 passed with PyQt6.
• Focused guideline tests - 16 KTool tests and 2 ImageTool tests passed with PySide6.
• uv run mypy src
• uv run ruff check
• uv run ruff format --check
• git diff --check

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.93%. Comparing base (e2cfcc0) to head (76fe54f).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
.../erlab/interactive/imagetool/_kspace_conversion.py	85.71%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #551   +/-   ##
=======================================
  Coverage   91.92%   91.93%           
=======================================
  Files         250      250           
  Lines       98764    98776   +12     
  Branches    16604    16608    +4     
=======================================
+ Hits        90793    90805   +12     
- Misses       4580     4581    +1     
+ Partials     3391     3390    -1     

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