fix(adminui,client): error boundary inside the interactive scope, stale-commit OnSaved, AbCip browse delay emit, DisposeBridge cancel (review R3)

M1: PageErrorBoundary wraps the body of every InteractiveServer page; the inert layout boundary is removed.
m1: DisposeBridge cancels its CTS when the 5 s wait times out.
m2: a CSV import that commits after the modal closed still raises OnSaved.
m3: document SecurityMode=None no-fallback in Client.CLI.md / Client.UI.md.
m4: browsePageDelayMs written only when loaded or changed; negative flagged.

Claude-Session: https://claude.ai/code/session_01Ef2ozxS7QPanGT8uoATbTe

src/Client/ZB.MOM.WW.OtOpcUa.Client.Shared/Adapters/ClientTelemetry.cs

@@ -29,7 +29,13 @@ internal static class DisposeBridge
         using var cts = new CancellationTokenSource(Timeout);
         try
         {
-            Task.Run(() => work(cts.Token), cts.Token).Wait(Timeout);
+            var task = Task.Run(() => work(cts.Token), cts.Token);
+            // Observe a late fault so it never surfaces as an unobserved-task exception.
+            _ = task.ContinueWith(t => _ = t.Exception, TaskContinuationOptions.OnlyOnFaulted);
+            // The CTS's own timer and this Wait race: when Wait loses, `using` would dispose the CTS before
+            // the token ever fired, leaving the work running while the caller goes on to dispose the session.
+            // Cancel explicitly so the in-flight Close/Delete is told to stop.
+            if (!task.Wait(Timeout)) { cts.Cancel(); }
         }
         catch
         {