Implement catalog startup diagnostics (T-616)

app-modern/ui/gio/catalog_events.go

@@ -0,0 +1,46 @@
+package gio
+
+import "softbox.local/core/application"
+
+type catalogPresentationState string
+
+const (
+	catalogStateLoading      catalogPresentationState = "loading"
+	catalogStateReady        catalogPresentationState = "ready"
+	catalogStateUnconfigured catalogPresentationState = "unconfigured"
+	catalogStateLoadFailed   catalogPresentationState = "load_failed"
+)
+
+func (shell *AppShell) applyCatalogEvent(event application.Event) (bool, error) {
+	payload, handled, err := application.ParseCatalogEvent(event)
+	if err != nil || !handled {
+		return handled, err
+	}
+	switch payload.Type {
+	case application.EventCatalogRefreshed:
+		shell.SetItems(payload.Items)
+	case application.EventCatalogRejected:
+		switch payload.FailureCode {
+		case application.CatalogFailureSourceUnconfigured:
+			shell.catalogState = catalogStateUnconfigured
+		case application.CatalogFailureLoadFailed:
+			shell.catalogState = catalogStateLoadFailed
+		}
+	}
+	return true, nil
+}
+
+func (shell *AppShell) catalogStatusText() string {
+	switch shell.catalogState {
+	case catalogStateLoading:
+		return "目录状态：正在加载已验证 Catalog"
+	case catalogStateUnconfigured:
+		return "目录状态：Catalog 来源尚未配置"
+	case catalogStateLoadFailed:
+		return "目录状态：Catalog 加载失败"
+	case catalogStateReady:
+		return "目录状态：已加载已验证 Catalog"
+	default:
+		return "目录状态：未知"
+	}
+}