feat: a sprint calendar

A Calendario tab lays the project's sprints out month by month as bands,
with the releases and the tickets due on each day. Owners and admins plan
a sprint by clicking the day it starts, and the whole plan downloads as an
iCalendar file. Tickets can be searched by due-date range.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

libs/api/tracker/presenters/src/lib/http/issues.controller.ts

@@ -164,6 +164,8 @@ export class IssuesController {
       labels: query.label,
       sprintId: query.sprintId,
       noSprint: query.noSprint,
+      dueFrom: query.dueFrom,
+      dueTo: query.dueTo,
       sort: query.sort,
       search: query.search,
       limit: query.limit,