Add BitFullCalendar extras component (#12449)

[msynk]

closes #12449

Summary by CodeRabbit

Release Notes

• New Features
  • Introduced BitFullCalendar component with multiple calendar views: Day, Week, Month, Year, and Agenda.
  • Added Timeline mode for resource scheduling and multi-resource event planning.
  • Implemented event management: create, edit, delete, and drag-and-drop events.
  • Added calendar customization: Dark mode, 24-hour format, color-coded events, and attendee tracking.
  • Included Fluent theme variant alongside the default theme.
  • Integrated localization support and event filtering by color and attendee.

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Walkthrough

Adds a new FullCalendar Blazor component suite with shared models, state, helpers, views, timeline mode, styling, and a demo page. It also wires navigation, localization, change notifications, drag/drop, resizing, and JS scrolling helpers.

Changes

FullCalendar suite

Layer / File(s)	Summary
Models, state, and helpers src/BlazorUI/Bit.BlazorUI.Extras/Components/FullCalendar/*	Shared enums, models, helpers, state, change notification, and JS interop wrappers are added for calendar data, filtering, navigation, and resize/scroll behavior.
Calendar shell and header controls src/BlazorUI/Bit.BlazorUI.Extras/Components/FullCalendar/*	The root component, header controls, filter/settings UI, mode/view tabs, date navigation, and toast surface are added and wired through shared cascading state and callbacks.
Day, week, month, year, and agenda views src/BlazorUI/Bit.BlazorUI.Extras/Components/FullCalendar/*	Agenda, day/week, month, and year views plus their shared cells, dialogs, drag/drop surfaces, and event rendering components are added around the shared calendar state.
Timeline mode views src/BlazorUI/Bit.BlazorUI.Extras/Components/FullCalendar/*	Timeline layout, day/week/month timeline views, and horizontal resize behavior are added with resource grouping, scroll targeting, and event block interactions.
Demo and navigation src/BlazorUI/Demo/Client/.../FullCalendar/*, src/BlazorUI/Demo/Client/.../Home/*, src/BlazorUI/Demo/Client/.../Shared/*	The demo page, demo code-behind, and navigation entries are added for the new FullCalendar route.

Sequence Diagram(s)

sequenceDiagram
  participant BitFullCalendar
  participant BitFullCalendarState
  participant BitFcCalendarHeader
  participant BitFcCalendarBody
  participant BitFcCalendarDayView
  participant BitFcTimelineDayView
  participant BitFcAgendaEvents
  participant BitFcCalendarToast
  BitFullCalendar->>BitFullCalendarState: initialize events, culture, options
  BitFullCalendar->>BitFcCalendarHeader: cascade State, Texts, Options
  BitFullCalendar->>BitFcCalendarBody: cascade State and templates
  BitFullCalendarState->>BitFcCalendarHeader: OnStateChanged
  BitFullCalendarState->>BitFcCalendarBody: OnStateChanged
  BitFcCalendarBody->>BitFcCalendarDayView: render day/week view data
  BitFcCalendarBody->>BitFcTimelineDayView: render timeline view data
  BitFcCalendarBody->>BitFcAgendaEvents: render agenda view data
  BitFullCalendarState->>BitFcCalendarToast: update toast list

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Estimated code review effort

🎯 5 (Critical) | ⏱️ ~120+ minutes

Poem

🐰 I hopped through views from dawn to dusk,
With calendar blooms and timeline musk.
Toasts went pop and headers gleamed,
New rabbit calendars softly dreamed.
Hop, hop—FullCalendar’s in the burrow!

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests