2297 remove roi ranges dict from spectrum viewer window model #2413
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Issue
Closes #2297
Description
Remove _roi_ranges dictionary from SpectrumViewerWindowModel. The model no longer needs to maintain its own list of ROI names since SpectrumWidget handles ROI management. This eliminates redundant code and reduces synchronization issues.
Testing
Updated unit tests to reflect method signature changes.
Acceptance Criteria
Verify all removed methods are unused.
Ensure all tests pass and functionality remains intact.