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/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Components/Pages/ScriptEdit.razor

@@ -14,6 +14,7 @@
 @inject IDbContextFactory<OtOpcUaConfigDbContext> DbFactory
 @inject NavigationManager Nav
 
+<PageErrorBoundary>
 <div class="d-flex justify-content-between align-items-center mb-3">
     <h4 class="mb-0">@(IsNew ? "New script" : "Edit script")</h4>
     <a href="/scripts" class="btn btn-outline-secondary btn-sm">Cancel</a>
@@ -72,6 +73,7 @@ else
         </div>
     </EditForm>
 }
+</PageErrorBoundary>
 
 @code {
     [Parameter] public string? ScriptId { get; set; }