Merge branch 'claude/group-creation-hosts-dragdrop-56c6a3'

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

@@ -222,6 +222,31 @@ internal sealed partial class HostRowViewModel(
     /// <summary>Whether this row has a vault to name.</summary>
     internal bool HasVaultBadge => VaultBadge.Length > 0;
 
+    /// <summary>
+    /// The name of the group this host is filed under, or empty for a host that is in none.
+    /// </summary>
+    /// <remarks>
+    /// <para>
+    /// What the desktop's grid draws as a chip on the card. It is the one thing the fold-away group headings
+    /// between the cards used to say, and the reason removing them cost nothing: a card that names its own
+    /// group answers the question per host, where a heading answered it per run of cards and needed the grid
+    /// to be sorted into runs to do it. The phone still draws headings — its list has no room for the row of
+    /// group cards the desktop puts above the grid — so <see cref="SidebarGroupHeader"/> stays.
+    /// </para>
+    /// <para>
+    /// Resolved once when the list is built, like <see cref="TagLabels"/> and for the same two reasons: the
+    /// row stores an id and a chip shows a name, and the answer cannot change without the list being rebuilt.
+    /// <b>A group id that does not resolve leaves this empty</b> rather than printing the id — the reference
+    /// is allowed to dangle, deleting a group deliberately does not rewrite the hosts in it, and "the group
+    /// this names is not here" and "this names no group" are the same thing to look at. See
+    /// <see cref="HostSecret.GroupId"/>.
+    /// </para>
+    /// </remarks>
+    internal string GroupLabel { get; init; } = string.Empty;
+
+    /// <summary>Whether this host is filed under a group the vault can name.</summary>
+    internal bool HasGroup => GroupLabel.Length > 0;
+
     internal HostSecret Host => host.Secret;
 
     /// <summary>
@@ -1051,8 +1076,8 @@ internal sealed partial class VaultViewModel(
             "No hosts yet. Press + NEW HOST to add one, or import the machines already in this computer's "
             + "~/.ssh/config from Preferences.",
         (_, not null, 0) =>
-            "Nothing is filed under this group yet. Drag a host onto its heading in the grid, or choose the "
-            + "group in a host's own editor.",
+            "Nothing is filed under this group yet. Press SHOW ALL, then drag a host card onto this group's "
+            + "card — or choose the group in a host's own editor.",
         _ => "No host matches that. The name, the address and the notes are all searched.",
     };
 
@@ -2396,6 +2421,12 @@ internal sealed partial class VaultViewModel(
                     // Only when there is something to tell apart. A badge on every row of a
                     // single-vault list is noise that says the same thing on all of them.
                     VaultBadge = several ? vault.Name.ToUpperInvariant() : string.Empty,
+
+                    // Every readable vault's groups, not the active one's, because a host in a team's
+                    // vault is filed under that team's group — and looked up here rather than on the row
+                    // for the reason the tag names are: the map is the list's, and a row that reached for
+                    // it would be a lookup per chip per redraw.
+                    GroupLabel = GroupLabelFor(item.Secret.GroupId),
                 }));
         }
 
@@ -2712,6 +2743,17 @@ internal sealed partial class VaultViewModel(
             .OrderBy(label => label, StringComparer.CurrentCulture),
     ];
 
+    /// <summary>
+    /// The name behind a host's group id, or empty where there is none to show.
+    /// </summary>
+    /// <remarks>
+    /// Empty covers both "this host is in no group" and "the group it names is not in this vault any more",
+    /// which is the same answer the list gives a dangling reference everywhere else. See
+    /// <see cref="HostRowViewModel.GroupLabel"/>.
+    /// </remarks>
+    private string GroupLabelFor(Guid? groupId) =>
+        groupId is { } id && groupsById.TryGetValue(id, out var group) ? group.Label : string.Empty;
+
     /// <summary>Refills <see cref="Groups"/>, counting the hosts filed under each.</summary>
     private void RebuildGroups()
     {
@@ -2895,10 +2937,10 @@ internal sealed partial class VaultViewModel(
     /// </summary>
     /// <remarks>
     /// <para>
-    /// What dragging a row onto a heading does, and the only thing in this application that changes a host
-    /// without opening the editor. That is the justification for it existing at all: filing thirty imported
-    /// machines meant thirty rounds of open, pick, save, and the field being changed is the one field of a
-    /// host that is about arrangement rather than about the machine.
+    /// What dragging a host card onto a group card does, and the only thing in this application that changes
+    /// a host without opening the editor. That is the justification for it existing at all: filing thirty
+    /// imported machines meant thirty rounds of open, pick, save, and the field being changed is the one
+    /// field of a host that is about arrangement rather than about the machine.
     /// </para>
     /// <para>
     /// It writes the saved host rather than the editor's contents, and refuses while the editor is open. A