Add Shift shortcut for selecting and deselecting multiple dates in between start and end dates

[peterchrjoergensen]

This pull request adds support for shift-click range selection in multiple-date mode for the date picker, along with the necessary logic and event handling to ensure a smooth user experience. The main changes include tracking the Shift key globally, managing range selection state, and updating selection logic to support adding or removing contiguous date ranges.

Multiple date selection improvements:

• Implemented shift-click range selection in multiple date mode: holding Shift and clicking an end date selects all dates between the anchor and the clicked date; starting from a selected date removes the range instead. [1] [2]
• Added global Shift key tracking and event listeners to handle Shift state, including cleanup on component unmount and window blur. [1] [2] [3]
• Updated selection logic to reset range selection state when all dates are cleared or removed. [1] [2]

Code enhancements:

• Added utility methods for normalizing dates, building date ranges, merging/removing selections, and checking if a date is selected.
• Updated imports to include formatIsoDate used in new selection logic.

Documentation:

• Updated README.md to describe the new shift-click range selection feature in multiple mode.

[Copilot]

Pull request overview

Adds Shift-click range selection for multiple-date mode in the Nova datepicker field by tracking Shift globally and expanding/removing contiguous date ranges between an anchor date and the clicked date.

Changes:

• Wire @date-click to custom range-selection handler for multi-date mode (add/remove ranges).
• Add Shift key global tracking + range selection helpers (normalize, range build, merge/remove, selected check).
• Document Shift range selection behavior in README; update compiled asset manifest hash.

Reviewed changes

Copilot reviewed 2 out of 4 changed files in this pull request and generated 4 comments.

File	Description
resources/js/components/FormField.vue	Add Shift-click range selection logic, global Shift tracking, and selection utilities for multi-date mode.
README.md	Document Shift-click range selection behavior in multiple mode.
dist/mix-manifest.json	Update asset hash for rebuilt JS bundle.

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