chore: remove orphaned CalendarDate and CalendarDateEventArgs

[damyanpetev]

Description

Found in #286 ; The CalendarDate and matching event args have no external references (i.e. not used for any of the components) and are likely an artifact of an older state generation and/or merely a static leftover that's not relevant anymore.

Type of Change (check all that apply):

• Bug fix
• New functionality
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactoring (no functional changes)
• Documentation
• Demos
• CI/CD
• Tests
• Changelog

Component(s) / Area(s) Affected:

How Has This Been Tested?

• Unit tests
• Manual testing
• Automated e2e tests

Test Configuration:

• .NET version:
• Hosting model:
• Browser(s):
• OS:

Screenshots / Recordings

Checklist:

• All relevant tags have been applied to this PR
• This PR includes unit tests covering all the new code
• This PR includes API docs for newly added methods/properties
• This PR includes general feature table updates in the root README.MD
• This PR includes CHANGELOG.MD updates for newly added functionality
• This PR contains breaking changes
• This PR includes behavioral changes and the feature specification has been updated with them
• Accessibility (ARIA, keyboard navigation, focus management) has been verified

Closes #

[Copilot]

Pull request overview

Removes the orphaned IgbCalendarDate and IgbCalendarDateEventArgs types (and their marshal-by-value registrations) from the Ignite UI for Blazor library, reducing unused public surface area and keeping the interop type maps in sync with actual component usage.

Changes:

• Removed IgbCalendarDate and IgbCalendarDateEventArgs source files from the Blazor wrappers.
• Deleted CalendarDate from the TypeScript marshalByValueSet used by the interop loader.
• Deleted CalendarDate handling from the C# marshal-by-value factory (MustMarshalByValue and CreateInstance).

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
src/src/Loader.ts	Removes CalendarDate from the JS/TS marshal-by-value registration set.
src/componentsBase/MarshalByValueFactory.cs	Removes CalendarDate from C# marshal-by-value checks and instance creation.
src/components/Blazor/CalendarDateEventArgs.cs	Deletes the unused IgbCalendarDateEventArgs wrapper type.
src/components/Blazor/CalendarDate.cs	Deletes the unused IgbCalendarDate wrapper type.