test(e2e): unify toast assertion + extract shared PlaywrightDbConnection (review cleanups)

tests/ZB.MOM.WW.ScadaBridge.CentralUI.PlaywrightTests/SiteCalls/SiteCallDataSeeder.cs

@@ -1,4 +1,5 @@
 using Microsoft.Data.SqlClient;
+using ZB.MOM.WW.ScadaBridge.CentralUI.PlaywrightTests.Cluster;
 
 namespace ZB.MOM.WW.ScadaBridge.CentralUI.PlaywrightTests.SiteCalls;
 
@@ -25,24 +26,11 @@ namespace ZB.MOM.WW.ScadaBridge.CentralUI.PlaywrightTests.SiteCalls;
 /// </summary>
 internal static class SiteCallDataSeeder
 {
-    private const string DefaultConnectionString =
-        "Server=localhost,1433;Database=ScadaBridgeConfig;User Id=scadabridge_app;Password=ScadaBridge_Dev1#;TrustServerCertificate=true;Encrypt=false;Connect Timeout=5";
-
-    private const string EnvVar = "SCADABRIDGE_PLAYWRIGHT_DB";
-
     /// <summary>
-    /// Connection string for the running cluster's configuration DB. Resolved
-    /// from <c>SCADABRIDGE_PLAYWRIGHT_DB</c> when set, otherwise the local docker
-    /// dev defaults.
+    /// Connection string for the running cluster's configuration DB.
+    /// Delegates to <see cref="PlaywrightDbConnection.ConnectionString"/>.
     /// </summary>
-    public static string ConnectionString
-    {
-        get
-        {
-            var fromEnv = Environment.GetEnvironmentVariable(EnvVar);
-            return string.IsNullOrWhiteSpace(fromEnv) ? DefaultConnectionString : fromEnv;
-        }
-    }
+    public static string ConnectionString => PlaywrightDbConnection.ConnectionString;
 
     /// <summary>
     /// Inserts a single row into the central <c>SiteCalls</c> table. Optional

tests/ZB.MOM.WW.ScadaBridge.CentralUI.PlaywrightTests/SiteCalls/SiteCallsPageTests.cs

@@ -320,10 +320,8 @@ public class SiteCallsPageTests
             // path can sit on the 10s inner relay timeout before the response —
             // and the toast itself auto-dismisses 5s after it appears, so the
             // assertion must catch it inside that window.
-            var toast = page.Locator(".toast");
-            await Assertions.Expect(toast).ToBeVisibleAsync(
-                new() { Timeout = 15_000 });
-            Assert.Equal(1, await toast.CountAsync());
+            await Assertions.Expect(page.Locator(".toast")).ToHaveCountAsync(
+                1, new() { Timeout = 15_000 });
         }
         finally
         {