feat: enable contact invitation and update invite logic

[ValeraFinebits]

Issue

#1033

Description

• Add "Invite Contact" menu item to context menu for contacts
• Exclude decentralized addresses from invite candidates

Other Information

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[Copilot]

Pull request overview

This PR enables the “Invite contact” action from the contacts context menu and updates invitation candidate selection to exclude decentralized addresses, aligning the invitation flow with issue #1033 (“Invitation page”).

Changes:

• Enables the “Invite contact” context menu item in the contacts list UI.
• Filters decentralized addresses out of invitation contact candidates.
• Adjusts invite message “To” construction logic used for preview/compose.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 5 comments.

File	Description
src/Eppie.App/Eppie.App.ViewModels/InvitationPageViewModel.cs	Filters decentralized contacts from candidate list; changes invite preview message recipient formatting.
src/Eppie.App/Eppie.App.UI/Eppie.App.UI.Shared/Controls/ContactsListControl.xaml	Exposes the “Invite contact” menu item in the contact context menu.

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