feat: add maxIntegrations property to widget definitions

Replaces the hardcoded audioStats check with a generic
maxIntegrations field on WidgetDefinition. The integration
select component respects this to enforce single-select mode.

packages/widgets/src/audio-stats/index.ts

@@ -16,6 +16,7 @@ export const { definition, componentLoader } = createWidgetDefinition("audioStat
   icon: IconHeadphones,
   supportedIntegrations: ["navidrome", "audiobookshelf"],
   integrationsRequired: true,
+  maxIntegrations: 1,
   createOptions() {
     return optionsBuilder.from(
       (factory) => ({

packages/widgets/src/definition.ts

@@ -42,6 +42,7 @@ export interface WidgetDefinition {
   icon: TablerIcon;
   supportedIntegrations?: IntegrationKind[];
   integrationsRequired?: boolean;
+  maxIntegrations?: number;
   createOptions: (
     settings: Pick<SettingsContextProps, "enableStatusByDefault" | "forceDisableStatus">,
   ) => WidgetOptionsRecord;

packages/widgets/src/modals/widget-edit-modal.tsx

@@ -117,7 +117,7 @@ export const WidgetEditModal = createModal<ModalProps<WidgetKind>>(({ actions, i
         <WidgetIntegrationSelect
           label={t("item.edit.field.integrations.label")}
           data={innerProps.integrationData}
-          canSelectMultiple={innerProps.kind !== "audioStats"}
+          canSelectMultiple={((widgetImports[innerProps.kind].definition as { maxIntegrations?: number }).maxIntegrations ?? Infinity) > 1}
           {...form.getInputProps("integrationIds")}
         />
       )}