fix: tasks endpoint→manual-tasks, add Leads page, add Leads to sidebar, fix field names

src/types/index.ts

@@ -207,3 +207,17 @@ export interface LegacyPaginatedResponse<T> {
   page: number;
   limit: number;
 }
+
+export interface Lead {
+  id: string;
+  firstName: string;
+  lastName: string;
+  phone: string;
+  email?: string;
+  address?: string;
+  status: 'NEW' | 'CONTACTED' | 'INTERESTED' | 'CONVERTED' | 'LOST';
+  source?: string;
+  notes?: string;
+  assignedTo?: { firstName: string; lastName: string };
+  createdAt: string;
+}