test(e2e): harden Transport export test — render sentinel + step-scoped Next (review fix)

tests/ZB.MOM.WW.ScadaBridge.CentralUI.PlaywrightTests/Transport/TransportExportTests.cs

@@ -57,7 +57,10 @@ public sealed class TransportExportTests
         {
             var page = await _fixture.NewAuthenticatedPageAsync("multi-role", "password");
             await page.GotoAsync($"{PlaywrightFixture.BaseUrl}/design/transport/export");
-            await page.WaitForLoadStateAsync(LoadState.NetworkIdle);
+            // Wait for Step-1 to render (OnInitializedAsync makes 8 repo calls over SignalR
+            // before the template tree appears — NetworkIdle is an unreliable proxy for this).
+            await Assertions.Expect(page.Locator("[data-testid='group-templates']"))
+                .ToBeVisibleAsync(new() { Timeout = 15_000 });
 
             // ── STEP 1: Select ────────────────────────────────────────────────────────
             // Narrow the tree to just the zztest template, then tick its checkbox.
@@ -82,9 +85,12 @@ public sealed class TransportExportTests
 
             // ── STEP 2: Review ────────────────────────────────────────────────────────
             // The seed group lists the picked template; Next is always enabled here.
+            // Scope the Next click to the Step-2 panel — identified by its unique
+            // #include-deps toggle — so it cannot accidentally match a Step-1 button.
             await Assertions.Expect(page.Locator("[data-testid='seed-group']"))
                 .ToBeVisibleAsync(new() { Timeout = 15_000 });
-            await page.Locator("button.btn.btn-primary:has-text('Next')").ClickAsync();
+            await page.Locator("div:has(#include-deps) button.btn.btn-primary:has-text('Next')")
+                .ClickAsync();
 
             // ── STEP 3: Encrypt ───────────────────────────────────────────────────────
             const string passphrase = "zztest-passphrase-123";