date-range selectedRange highlighted date fix

[sreyaswimlane]

Summary

This pull request addresses issues with the ngx-date-range-picker component, specifically improving how preset date range values are handled when the cancel action is used, and fixing date highlighting for provided selectedRange values. The main changes ensure that relative date presets (like "last 7 days") are preserved and not converted to static timestamps when canceling, and that the UI correctly highlights the selected range.

Date Range Preset Handling Improvements:

• The lastConfirmedRange object in date-range-picker.component.ts now stores both the resolved dates and their original raw expressions, allowing the component to restore relative presets after canceling instead of converting them to timestamps. [1] [2] [3] [4]

Bug Fixes in UI Behavior:

• Fixed highlighting of dates in the calendar for given selectedRange values, improving the user experience when interacting with preset ranges.

Changelog Updates:

• Updated CHANGELOG.md to document the above fixes for better tracking and communication with users.
  Setting rangeModel values based on the processed selectedRange value

Checklist

• *Added unit tests
• *Added a code reviewer
• Added changes to /projects/swimlane/ngx-ui/CHANGELOG.md under HEAD (Unreleased)
• Updated the demo page
• Included screenshots of visual changes

*required

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