Give the application a settings area built from what really exists

src/DodoSSH.Client.Shell/ViewModels/VaultsViewModel.cs

@@ -107,6 +107,9 @@ internal sealed record VaultRowViewModel(
     };
 
     internal bool HasState => State.Length > 0;
+
+    /// <summary>The single letter the settings page's card draws on this vault's tile.</summary>
+    internal string Initial => Name.Length > 0 ? Name[..1].ToUpperInvariant() : "?";
 }
 
 /// <summary>One member of a vault, as a row in the members table.</summary>
@@ -153,6 +156,32 @@ internal sealed record VaultMemberRowViewModel(TeamMemberSummary Member, bool Is
 
     internal bool CanBeRemoved => Member.Role != TeamMemberRole.Owner;
 
+    /// <summary>
+    /// The two letters the members panel draws on this row's avatar.
+    /// </summary>
+    /// <remarks>
+    /// The same rule <c>HostRowViewModel.Monogram</c> draws a card's monogram by — the first letters of the
+    /// first two words in the name, or the first two characters where it is one word — except uppercase,
+    /// which is how the design draws a person's initials rather than a host's.
+    /// </remarks>
+    internal string Initials
+    {
+        get
+        {
+            var words = Name.Split(
+                InitialsWordSeparators,
+                StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
+
+            var letters = words.Length >= 2
+                ? string.Concat(words[0][0], words[1][0])
+                : Name.Length >= 2 ? Name[..2] : Name;
+
+            return letters.ToUpperInvariant();
+        }
+    }
+
+    private static readonly char[] InitialsWordSeparators = [' ', '-', '_', '.'];
+
     /// <summary>Whether this member's role can be changed at all.</summary>
     /// <remarks>
     /// The owner's cannot, and not for want of an endpoint: ownership is sole, so demoting them is
@@ -312,6 +341,33 @@ internal sealed partial class VaultsViewModel(
     [ObservableProperty]
     private bool isBusy;
 
+    /// <summary>
+    /// Whether the members panel — v5c's settings-page overlay over the selected vault's people — is open.
+    /// </summary>
+    /// <remarks>
+    /// Desktop-only presentation state, not a fact about any vault: it says which rectangle is on screen and
+    /// nothing else. Selecting a vault is what actually reads its members, in
+    /// <see cref="OnSelectedVaultChanged"/>; opening this panel over one already selected re-reads nothing.
+    /// </remarks>
+    [ObservableProperty]
+    private bool isMembersPanelOpen;
+
+    /// <summary>Opens the members panel, selecting the vault it is about first if it is not selected already.</summary>
+    [RelayCommand]
+    private void OpenMembersPanel(VaultRowViewModel? vault)
+    {
+        if (vault is not null && !ReferenceEquals(vault, SelectedVault))
+        {
+            SelectedVault = vault;
+        }
+
+        IsMembersPanelOpen = true;
+    }
+
+    /// <summary>Closes the members panel.</summary>
+    [RelayCommand]
+    private void CloseMembersPanel() => IsMembersPanelOpen = false;
+
     // ---- Creating a vault ----
 
     [ObservableProperty]
@@ -824,6 +880,38 @@ internal sealed partial class VaultsViewModel(
         Status = string.Empty;
     }
 
+    /// <summary>Opens the rename form for a specific vault, from the settings page's per-card edit icon.</summary>
+    /// <remarks>
+    /// A thin wrapper around <see cref="RenameVault"/> rather than a second implementation: the settings
+    /// page draws one card per vault with no list selection to lean on the way this screen used to have, so
+    /// this selects the row first and then asks the command that already knows how to open the form.
+    /// </remarks>
+    /// <param name="vault">The vault to rename.</param>
+    [RelayCommand]
+    private void RenameVaultRow(VaultRowViewModel? vault)
+    {
+        if (vault is not null)
+        {
+            SelectedVault = vault;
+        }
+
+        RenameVaultCommand.Execute(null);
+    }
+
+    /// <summary>Arms the delete confirmation for a specific vault, from the settings page's per-card delete icon.</summary>
+    /// <inheritdoc cref="RenameVaultRow" path="/remarks" />
+    /// <param name="vault">The vault to ask about deleting.</param>
+    [RelayCommand]
+    private void DeleteVaultRow(VaultRowViewModel? vault)
+    {
+        if (vault is not null)
+        {
+            SelectedVault = vault;
+        }
+
+        DeleteVaultCommand.Execute(null);
+    }
+
     /// <summary>
     /// Saves the renamed vault.
     /// </summary>
@@ -1538,6 +1626,13 @@ internal sealed partial class VaultsViewModel(
         PendingAction = null;
         IsRenamingVault = false;
 
+        // The members panel is drawn over one vault's people; a selection that clears altogether — the
+        // vault it was showing got deleted, or the list emptied — leaves nothing for it to be about.
+        if (value is null)
+        {
+            IsMembersPanelOpen = false;
+        }
+
         if (isReselecting)
         {
             return;