[date-picker]: rounds up all remaining styling bugs

[Elijbet]

Actual Behavior

Rounds up all remaining styling bugs on date-picker:

• Hover starts selecting from the beginning of the month (Input Date Picker Range: start date's hover style starts at the beginning of the month #6194)
• Unwanted blue gradient highlight when hovering/active/selected on the start-range date
• Same behavior when the start-range date is selected and the end-range is being hovered/active/selected
• Hovering/active past end-range also creates an unwanted white highlight over the grey gradient
• All these issues are true and need to be addressed for both rtl and ltr

Expected Behavior

Remove the highlight.

Reproduction Sample

See demo.

Reproduction Steps

N/A

Reproduction Version

v1.0.0-beta.99

Relevant Info

No response

Regression?

No response

Impact

No response

Esri team

Calcite (dev)

[geospatialem]

Need design expertise and input across the date-picker component.

Recommendation should also list the priority of items to tackle.