feat(#41): implement widget system backend (closes #41)

packages/shared/src/types/widget.types.ts

@@ -68,7 +68,11 @@ export type WidgetComponentType =
   | "TasksWidget"
   | "CalendarWidget"
   | "QuickCaptureWidget"
-  | "AgentStatusWidget";
+  | "AgentStatusWidget"
+  | "StatCardWidget"
+  | "ChartWidget"
+  | "ListWidget"
+  | "CalendarPreviewWidget";
 
 /**
  * Props for individual widgets
@@ -79,3 +83,83 @@ export interface WidgetProps {
   onEdit?: () => void;
   onRemove?: () => void;
 }
+
+/**
+ * Widget configuration types
+ */
+export interface StatCardConfig {
+  title?: string;
+  dataSource: "tasks" | "events" | "projects";
+  metric: "count" | "completed" | "overdue" | "upcoming";
+  filter?: Record<string, unknown>;
+  color?: string;
+  icon?: string;
+}
+
+export interface ChartConfig {
+  title?: string;
+  chartType: "bar" | "line" | "pie" | "donut";
+  dataSource: "tasks" | "events" | "projects";
+  groupBy: "status" | "priority" | "project" | "day" | "week" | "month";
+  filter?: Record<string, unknown>;
+  colors?: string[];
+}
+
+export interface ListConfig {
+  title?: string;
+  dataSource: "tasks" | "events" | "projects";
+  sortBy?: string;
+  sortOrder?: "asc" | "desc";
+  limit?: number;
+  filter?: Record<string, unknown>;
+  showStatus?: boolean;
+  showDueDate?: boolean;
+}
+
+export interface CalendarPreviewConfig {
+  title?: string;
+  view: "day" | "week" | "agenda";
+  showTasks?: boolean;
+  showEvents?: boolean;
+  daysAhead?: number;
+}
+
+/**
+ * Widget data response types
+ */
+export interface WidgetStatData {
+  value: number;
+  change?: number;
+  changePercent?: number;
+  previousValue?: number;
+}
+
+export interface WidgetChartData {
+  labels: string[];
+  datasets: {
+    label: string;
+    data: number[];
+    backgroundColor?: string[];
+  }[];
+}
+
+export interface WidgetListItem {
+  id: string;
+  title: string;
+  subtitle?: string;
+  status?: string;
+  priority?: string;
+  dueDate?: string;
+  startTime?: string;
+  color?: string;
+}
+
+export interface WidgetCalendarItem {
+  id: string;
+  title: string;
+  startTime: string;
+  endTime?: string;
+  allDay?: boolean;
+  type: "task" | "event";
+  color?: string;
+}