fix: pass task_type=[-1] to tasks_list — required param, -1 means all types

NewBook returns 412 if task_type is absent. The original dailylist plugin
always passes [-1] as a fallback when no specific types are configured.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/src/lib/newbook.js

@@ -75,6 +75,7 @@ export async function fetchTasks(fromDate, toDate) {
     period_from:     `${fromDate} 00:00:00`,
     period_to:       `${toDate} 23:59:59`,
     show_uncomplete: 'true',
+    task_type:       [-1],  // -1 = all types; required by the API
   })
   return res?.data ?? []
 }