pi-agent: Fix final integrated review

internal/tui/foundation_test.go

@@ -46,6 +46,37 @@ func TestCompleteModelRendersResponsiveTerminalSizeClasses(t *testing.T) {
 	})
 }
 
+func TestCompleteModelWideLayoutUsesOriginalTerminalBoundary(t *testing.T) {
+	module := responsiveLayoutModule()
+
+	for _, test := range []struct {
+		name        string
+		width       int
+		height      int
+		wantWide    bool
+		expandError bool
+	}{
+		{name: "one row below height boundary", width: 100, height: 27},
+		{name: "exact boundary", width: 100, height: 28, wantWide: true},
+		{name: "expanded error does not change exact boundary", width: 100, height: 28, wantWide: true, expandError: true},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			model := resizedModel(t, module, themeModeNoColor, test.width, test.height)
+			if test.expandError {
+				model.operation.currentError = &operationError{
+					status: app.OperationStatus{Kind: app.StatusError, Summary: "Target update failed"},
+					detail: strings.Repeat("expanded diagnostic line\n", 20),
+				}
+				model.operation.errorExpanded = true
+			}
+			view := model.View()
+			if got := sameLine(view, "Targets", "Target details"); got != test.wantWide {
+				t.Fatalf("side-by-side = %v, want %v at %dx%d (expanded=%v):\n%s", got, test.wantWide, test.width, test.height, test.expandError, view)
+			}
+		})
+	}
+}
+
 func TestCompleteModelResizePreservesValidSelectionAndFormFocus(t *testing.T) {
 	module := responsiveLayoutModule()
 	model := resizedModel(t, module, themeModeNoColor, 120, 36)