Effective config: editable badge in view mode, refresh on continue/stop after save failure

- Multi-value items: EditableAsButton=true so 'editable' badge is clickable in view
  mode and activates the field like other editable badges.
- Save modal: 'Continue editing' after ValidateFailed/ReloadFailed now discards
  session, refreshes config from disk, then re-enters edit mode so remove/UI
  work correctly.
- 'Stop editing' after ValidateFailed/ReloadFailed now triggers config refresh
  so the invalid value on disk is shown instead of stale UI.
- SaveFlow: HandleCloseAndEndEdit invokes OnSaveCompleted when in failed state;
  OnContinueEditing uses EventCallback.Factory.Create to fix method-group
  conversion warning.

src/DnsmasqWebUI/Components/EffectiveConfig/Composition/EffectiveConfigSection.razor

@@ -28,7 +28,7 @@
     </CascadingValue>
     </CascadingValue>
     <EffectiveConfigSaveFlow ShowModal="@_showSaveModal" PendingChanges="@Session.PendingChanges" Status="@Status" Session="@Session"
-        OnClose="CloseSaveModal" OnSaveCompleted="OnSaveCompleted" OnCloseAndEndEdit="CloseSaveModalAndEndEdit" />
+        OnClose="CloseSaveModal" OnSaveCompleted="OnSaveCompleted" OnContinueEditingAfterSavedFailure="ContinueEditingAfterSavedFailureAsync" OnCloseAndEndEdit="CloseSaveModalAndEndEdit" />
 </div>
 }
 
@@ -212,6 +212,15 @@
         StateHasChanged();
     }
 
+    private async Task ContinueEditingAfterSavedFailureAsync()
+    {
+        _showSaveModal = false;
+        Session.ExitEditModeDiscard();
+        await OnSaveCompleted.InvokeAsync();
+        Session.EnterEditMode();
+        StateHasChanged();
+    }
+
     private void CloseSaveModalAndEndEdit()
     {
         _showSaveModal = false;

src/DnsmasqWebUI/Components/EffectiveConfig/Fields/EffectiveConfigMultiValueItem.razor

@@ -6,7 +6,7 @@
     @Value
     <OptionStateBadge AnchorId="@(ReadonlyBadgeAnchorId ?? "")" Source="@Source" OptionName="@OptionName" Value="@Value"
                      IsInteractive="@(IsEditMode && !ReadonlyClickActivatesField && !string.IsNullOrEmpty(ReadonlyBadgeAnchorId))"
-                     ShowEditableBadge="@(Source?.IsReadOnly != true)" EditableAsButton="@IsEditMode"
+                     ShowEditableBadge="@(Source?.IsReadOnly != true)" EditableAsButton="true"
                      FieldKey="@FieldKey" ReadonlyClickActivatesField="@ReadonlyClickActivatesField" ReadonlyTitleOverride="@ReadonlyTitleOverride" />
 </span>
 

src/DnsmasqWebUI/Components/EffectiveConfig/Modals/EffectiveConfigSaveFlow.razor

@@ -16,10 +16,11 @@
         SaveResult="@_saveResult"
         RestoreResult="@_restoreResult"
         OnClose="@OnClose"
+        OnContinueEditing="@(EventCallback.Factory.Create(this, HandleContinueEditing))"
         OnSave="@HandleSave"
         OnRestore="@HandleRestore"
         OnReverted="@HandleReverted"
-        OnCloseAndEndEdit="@OnCloseAndEndEdit" />
+        OnCloseAndEndEdit="@HandleCloseAndEndEdit" />
 }
 
 @code {
@@ -39,6 +40,7 @@
     [Parameter] public DnsmasqServiceStatus? Status { get; set; }
     [Parameter] public EventCallback OnClose { get; set; }
     [Parameter] public EventCallback OnSaveCompleted { get; set; }
+    [Parameter] public EventCallback OnContinueEditingAfterSavedFailure { get; set; }
     [Parameter] public EventCallback OnCloseAndEndEdit { get; set; }
     [Parameter] public IEffectiveConfigEditSession Session { get; set; } = null!;
 
@@ -127,4 +129,23 @@
         _saveState = SaveUiState.RestoreFailed;
         await InvokeAsync(StateHasChanged);
     }
+
+    private async Task HandleContinueEditing()
+    {
+        if (_saveState == SaveUiState.ValidateFailed || _saveState == SaveUiState.ReloadFailed)
+        {
+            await OnContinueEditingAfterSavedFailure.InvokeAsync();
+            return;
+        }
+
+        await OnClose.InvokeAsync();
+    }
+
+    private async Task HandleCloseAndEndEdit()
+    {
+        await OnCloseAndEndEdit.InvokeAsync();
+
+        if (_saveState == SaveUiState.ValidateFailed || _saveState == SaveUiState.ReloadFailed)
+            await OnSaveCompleted.InvokeAsync();
+    }
 }

src/DnsmasqWebUI/Components/EffectiveConfig/Modals/EffectiveConfigSaveModal.razor

@@ -153,7 +153,7 @@
                 @if ((SaveState == EffectiveConfigSaveFlow.SaveUiState.ReloadFailed || SaveState == EffectiveConfigSaveFlow.SaveUiState.ValidateFailed) && SaveResult?.BackupPath != null)
                 {
                     <button type="button" class="btn btn-primary" @onclick="() => Restore(SaveResult.BackupPath)"><i class="bi bi-arrow-counterclockwise me-1" aria-hidden="true"></i>Restore backup</button>
-                    <button type="button" class="btn btn-outline-warning" @onclick="Close"><i class="bi bi-pencil me-1" aria-hidden="true"></i>Continue editing</button>
+                    <button type="button" class="btn btn-outline-warning" @onclick="ContinueEditing"><i class="bi bi-pencil me-1" aria-hidden="true"></i>Continue editing</button>
                     <button type="button" class="btn btn-danger" @onclick="CloseAndEndEdit"><i class="bi bi-x-circle me-1" aria-hidden="true"></i>Stop editing</button>
                 }
                 else if (SaveState == EffectiveConfigSaveFlow.SaveUiState.RestoreFailed)
@@ -184,6 +184,7 @@
     [Parameter] public EffectiveConfigSaveResult? SaveResult { get; set; }
     [Parameter] public EffectiveConfigRestoreResult? RestoreResult { get; set; }
     [Parameter] public EventCallback OnClose { get; set; }
+    [Parameter] public EventCallback OnContinueEditing { get; set; }
     [Parameter] public EventCallback OnSave { get; set; }
     [Parameter] public EventCallback<string> OnRestore { get; set; }
     [Parameter] public EventCallback OnReverted { get; set; }
@@ -262,6 +263,12 @@
         await OnClose.InvokeAsync();
     }
 
+    private async Task ContinueEditing()
+    {
+        if (!AllowClose) return;
+        await OnContinueEditing.InvokeAsync();
+    }
+
     private async Task Save()
     {
         await OnSave.InvokeAsync();