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/Deployments.razor

@@ -15,6 +15,7 @@
 @inject ZB.MOM.WW.OtOpcUa.AdminUI.Deployments.DeploymentDriftProbe DriftProbe
 @rendermode InteractiveServer
 
+<PageErrorBoundary>
 <PageTitle>Deployments</PageTitle>
 
 <h1>Deployments</h1>
@@ -64,6 +65,7 @@
         }
     </tbody>
 </table>
+</PageErrorBoundary>
 
 @code {
     // Blob-free projection: the Deployment entity carries a varbinary(max) ArtifactBlob (a whole-fleet