feat(ui): secured-write history paging + submission age in approve dialog (arch-review S2/P3)

Claude-Session: https://claude.ai/code/session_01MtdgwpEeCUn6cUA5f1LMPj

src/ZB.MOM.WW.ScadaBridge.CentralUI/Services/ISecuredWriteService.cs

@@ -92,13 +92,18 @@ public interface ISecuredWriteService
 
     /// <summary>
     /// Lists secured writes, optionally filtered by <paramref name="status"/> and
-    /// <paramref name="siteId"/> (read-only — any authenticated user). On any failure
-    /// an empty list is returned so the page renders gracefully.
+    /// <paramref name="siteId"/> with offset paging (read-only — any authenticated user).
+    /// On any failure an empty result (<c>TotalCount = 0</c>) is returned so the page
+    /// renders gracefully. The returned <see cref="SecuredWriteListResult.TotalCount"/> is
+    /// the unpaged match count, so the page can drive a pager independent of page size.
     /// </summary>
     /// <param name="status">Status filter; <c>null</c> matches every status.</param>
     /// <param name="siteId">Site id filter; <c>null</c> matches every site.</param>
+    /// <param name="skip">Rows to skip (offset paging); clamped to &gt;= 0 server-side.</param>
+    /// <param name="take">Maximum rows to return; clamped to 1..500 server-side.</param>
     /// <param name="cancellationToken">Cancellation token.</param>
-    /// <returns>A task resolving to the matching rows, newest submission first.</returns>
-    Task<IReadOnlyList<SecuredWriteDto>> ListAsync(
-        string? status, string? siteId, CancellationToken cancellationToken = default);
+    /// <returns>A task resolving to the matching page + total match count, newest submission first.</returns>
+    Task<SecuredWriteListResult> ListAsync(
+        string? status, string? siteId, int skip = 0, int take = 200,
+        CancellationToken cancellationToken = default);
 }