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>

apps/mcp/src/app/api/taskstream.schema.ts

@@ -3924,6 +3924,10 @@ export interface operations {
                 sprintId?: string;
                 /** @description Only tickets in no sprint */
                 noSprint?: boolean;
+                /** @description Due on or after this day */
+                dueFrom?: string;
+                /** @description Due on or before this day */
+                dueTo?: string;
                 /** @description RECENT (default): last updated first. RANK: backlog order. */
                 sort?: components["schemas"]["IssueSort"];
                 /** @description Matches key, title or description */