test(playwright): drive the instance picker on Flow Debugger and Debug View

Flow Debugger's script-entry instance selection and Debug View's instance
selection both go through the shared InstancePicker combobox now instead of
a flat <select>. Update the tests to type into the {prefix}-input, wait for
the matching {prefix}-row, and click it; keep the <select>-polling helper
for the site select, which is unchanged.

Claude-Session: https://claude.ai/code/session_01NcMG6xXdsJbmD2wYAgkK29

tests/ZB.MOM.WW.ScadaBridge.CentralUI.PlaywrightTests/Deployment/DebugViewTreeTests.cs

@@ -76,11 +76,11 @@ public class DebugViewTreeTests : IClassFixture<DeploymentFixture>
             // Select the seeded site + Enabled instance (same hooks as DebugViewTests).
             await page.Locator("[data-test='debug-site-select']")
                 .SelectOptionAsync(new SelectOptionValue { Value = _cluster.SiteAId.ToString() });
-            var instanceOption = page.Locator("[data-test='debug-instance-select'] option",
-                new() { HasText = uniqueName });
-            await Assertions.Expect(instanceOption).ToHaveCountAsync(1, new() { Timeout = 10_000 });
-            await page.Locator("[data-test='debug-instance-select']")
-                .SelectOptionAsync(new SelectOptionValue { Value = instanceId.ToString() });
+            await page.Locator("[data-test='debug-instance-input']").FillAsync(uniqueName);
+            var instanceRow = page.Locator(
+                $"[data-test='debug-instance-row'][data-instance-id='{instanceId}']");
+            await Assertions.Expect(instanceRow).ToBeVisibleAsync(new() { Timeout = 10_000 });
+            await instanceRow.ClickAsync();
 
             var connect = page.Locator("button.btn.btn-primary.btn-sm:has-text('Connect')");
             await Assertions.Expect(connect).ToBeEnabledAsync(new() { Timeout = 10_000 });