Merge pull request 'Let the host editor make the credential it is about to bind' (#5) from claude/host-credentials-saved-sets-1786d4 into main

Reviewed-on: #5

src/DodoSSH.Client.App/Views/HostDrawer.axaml

@@ -584,6 +584,56 @@
                   </ComboBox.ItemTemplate>
                 </ComboBox>
 
+                <!--
+                  Making a credential without leaving the host. The moment one is wanted is this one: somebody
+                  is deciding how a host authenticates and finds the password is not in the keychain yet, and
+                  sending them to the other screen to add it would lose the half-typed host they are standing
+                  in. Same argument as the new-tag box further down, same immediate write, same honest
+                  consequence — the credential stays if this editor is cancelled, because a host can only name
+                  an id that exists.
+
+                  A button beside the picker rather than an entry inside it. Every row of that list is a
+                  binding the host can have; "make a new one" is an action, and as an entry it would sit in the
+                  box afterwards describing a state no host can be in.
+                -->
+                <Button Classes="ghost" Content="+ NEW CREDENTIAL" HorizontalAlignment="Left"
+                        FontSize="10.5" Height="28" Padding="10,0"
+                        IsVisible="{Binding !IsAddingEditorCredential}"
+                        Command="{Binding BeginEditorCredentialCommand}"
+                        ToolTip.Tip="Adds a credential to the keychain and binds this host to it" />
+
+                <Border CornerRadius="12" Background="{StaticResource Field}"
+                        BorderBrush="{StaticResource Border}" BorderThickness="1" Padding="12"
+                        IsVisible="{Binding IsAddingEditorCredential}">
+                  <StackPanel Spacing="6">
+                    <TextBlock Classes="label" Text="NEW CREDENTIAL" FontSize="10" />
+                    <TextBox Text="{Binding EditorNewCredentialLabel}" PlaceholderText="name" Height="36" />
+                    <!--
+                      Optional, and what makes a credential worth being its own item: one account on twenty
+                      machines is rotated in one place. Left blank, this host's own username is used.
+                    -->
+                    <TextBox Text="{Binding EditorNewCredentialUsername}" Height="36"
+                             PlaceholderText="username (blank: use this host's own)" />
+                    <!-- Masked, on the reasoning the keychain's own password box carries. -->
+                    <TextBox Text="{Binding EditorNewCredentialPassword}" PlaceholderText="password"
+                             PasswordChar="•" Height="36">
+                      <TextBox.KeyBindings>
+                        <KeyBinding Gesture="Enter" Command="{Binding AddEditorCredentialCommand}" />
+                      </TextBox.KeyBindings>
+                    </TextBox>
+                    <TextBox Text="{Binding EditorNewCredentialNotes}" PlaceholderText="notes"
+                             AcceptsReturn="True" Height="44" TextWrapping="Wrap" />
+                    <TextBlock Classes="hint" FontSize="10.5" TextWrapping="Wrap"
+                               Text="Added to the keychain as soon as you press ADD, so it stays even if you cancel this host. Renaming and deleting are on the keychain screen." />
+                    <StackPanel Orientation="Horizontal" Spacing="6">
+                      <Button Classes="accent" Content="ADD"
+                              Command="{Binding AddEditorCredentialCommand}" />
+                      <Button Classes="ghost" Content="CANCEL"
+                              Command="{Binding CancelEditorCredentialCommand}" />
+                    </StackPanel>
+                  </StackPanel>
+                </Border>
+
                 <!--
                   ◆ THE RELAY CARD, restyled to the mock's nested-card shape — radius 12, a checkbox with the
                   title beside it rather than under it — but NOT to the mock's copy. The sentence stays