Add tests to confirm Investigation lazy load on create

Author: cbrandtbuffalo

t/playwright/incident_create.t

@@ -0,0 +1,52 @@
+use strict;
+use warnings;
+
+use RT::IR::Test tests => undef, playwright => 1;
+
+my ( $url, $p ) = RT::Test->started_ok;
+$p->login();
+
+# Set a realistic viewport so the Investigation section starts below
+# the fold.
+$p->{page}->setViewportSize( { width => 1280, height => 720 } );
+
+$p->get_ok('/RTIR/Incident/Create.html?Lifecycle=incidents');
+$p->wait_for_htmx;
+
+my $incident_section     = $p->{page}->locator('#ticket-create-incident');
+my $investigation_section = $p->{page}->locator('#ticket-create-investigation');
+
+ok( $incident_section->isVisible,      'Incident section is visible above the fold' );
+ok( $investigation_section->count > 0, 'Investigation section is rendered in the DOM' );
+
+# Each widget is wrapped by HTMXLoadStart in a div with the
+# class="htmx-load-widget" and an hx-trigger attribute. The trigger
+# should be "...load" for eager (Incident half, above the fold) and
+# "...revealed" for lazy (Investigation half, below the fold).
+my $incident_widget      = $incident_section->locator('.htmx-load-widget')->first;
+my $investigation_widget = $investigation_section->locator('.htmx-load-widget')->first;
+
+my $inc_trigger = $incident_widget->getAttribute('hx-trigger') // '';
+my $inv_trigger = $investigation_widget->getAttribute('hx-trigger') // '';
+
+like( $inc_trigger, qr/\bload\b/,
+      "Incident widget triggers on load (hx-trigger='$inc_trigger')" );
+like( $inv_trigger, qr/\brevealed\b/,
+      "Investigation widget triggers on reveal (hx-trigger='$inv_trigger')" );
+
+# Behavior check: an unloaded htmx widget still has a content placeholder
+# inside; once htmx fires and swaps in real content the placeholder is
+# gone. Investigation widget should still have the placeholder until the
+# user scrolls.
+my $placeholder = $investigation_widget->locator('.htmx-widget-content-placeholder');
+ok( $placeholder->count > 0,
+    'Investigation widget content has not loaded yet (placeholder still present)' );
+
+$investigation_widget->scrollIntoViewIfNeeded;
+$p->wait_for_htmx;
+
+is( $investigation_widget->locator('.htmx-widget-content-placeholder')->count, 0,
+    'Investigation widget content loaded after scrolling into view' );
+
+$p->logout;
+done_testing;