Dev a10f03edc8 feat(06-02): add global site selection state, command, and broadcast to MainWindowViewModel ...

- Add OpenGlobalSitePickerDialog factory property (dialog factory pattern)
- Add GlobalSelectedSites ObservableCollection<SiteInfo>
- Add GlobalSitesSelectedLabel computed property for toolbar display
- Add OpenGlobalSitePickerCommand (disabled when no profile selected)
- Broadcast GlobalSitesChangedMessage via WeakReferenceMessenger on collection change
- Clear GlobalSelectedSites on tenant switch (OnSelectedProfileChanged)
- Clear GlobalSelectedSites on session clear (ClearSessionAsync)
- Add using SharepointToolbox.Views.Dialogs for SitePickerDialog cast

2026-04-07 10:03:30 +02:00

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