feat: add workspace view mode settings

frontend-web/src/core/system-settings/api.ts

@@ -90,13 +90,18 @@ export async function loadPrivateSquareStatus(): Promise<PrivateSquareStatus> {
 }
 
 export type ThemeMode = "light" | "dark";
+export type ViewMode = "card" | "list";
 
 export interface AppearanceSettings {
   default_theme: ThemeMode;
+  default_skill_view: ViewMode;
+  default_agent_view: ViewMode;
 }
 
 export interface AppearanceUpdate {
   default_theme?: ThemeMode;
+  default_skill_view?: ViewMode;
+  default_agent_view?: ViewMode;
 }
 
 export async function loadAppearanceSettings(): Promise<AppearanceSettings> {