connects #2154

This pull request adds functionality to compare imported predictor readings against existing data, allowing users to view differences in a modal dialog. It introduces new UI elements for displaying comparison results, including sortable tables and tooltips, and improves data handling to prevent unintended mutations. The changes are grouped into enhancements to comparison logic, UI updates, and code/data improvements.

Comparison logic enhancements:

• Added comparePredictorReadings() method and supporting state to ProcessPredictorReadingsComponent to compute and store differences between imported and existing predictor readings by predictor and facility, including difference and percentage difference calculations.
• Introduced PredictorReadingComparison interface to structure comparison data for display.

UI updates:

• Added a modal popup to display a sortable table of predictor reading differences, with controls for opening/closing and ordering by various fields.
• Updated the predictor readings summary table to show an eye icon for predictors with differences, allowing users to open the modal for detailed comparison.
• Replaced static "Existing Predictors Entries" header with a tooltip-enabled label for improved user guidance.

Code/data improvements:

• Modified data import logic in UploadDataV3Service to clone existing predictor data before modifying, preventing unintended mutations to original data objects.