docs: complete XML doc coverage (returns, summaries, inheritdoc)

Resolve all 622 issues flagged by the enhanced CommentChecker: add missing
<returns> tags (incl. the standard phrasing on non-generic Task methods),
add missing <summary> tags, and replace misused/redundant <inheritdoc/> on
members that override or implement nothing with real documentation.
Documentation-only — no behavior change; solution builds clean.

src/ZB.MOM.WW.ScadaBridge.CentralUI/Components/Shared/IDialogService.cs

@@ -18,6 +18,7 @@ public interface IDialogService
     /// <param name="danger">When <c>true</c>, the confirm button renders in
     /// <c>btn-danger</c> styling with the label "Delete"; otherwise a primary
     /// "Confirm" button is shown.</param>
+    /// <returns>A task that resolves to <c>true</c> when the user confirms, or <c>false</c> when cancelled.</returns>
     Task<bool> ConfirmAsync(string title, string message, bool danger = false);
 
     /// <summary>
@@ -28,5 +29,6 @@ public interface IDialogService
     /// <param name="label">Label rendered above the input field.</param>
     /// <param name="initialValue">Pre-populated value for the input field.</param>
     /// <param name="placeholder">Optional placeholder shown when the input is empty.</param>
+    /// <returns>A task that resolves to the entered string, or <c>null</c> if the user cancels.</returns>
     Task<string?> PromptAsync(string title, string label, string initialValue = "", string? placeholder = null);
 }