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/api/openapi.json

@@ -2278,6 +2278,26 @@
               "type": "boolean"
             }
           },
+          {
+            "name": "dueFrom",
+            "required": false,
+            "in": "query",
+            "description": "Due on or after this day",
+            "schema": {
+              "format": "date",
+              "type": "string"
+            }
+          },
+          {
+            "name": "dueTo",
+            "required": false,
+            "in": "query",
+            "description": "Due on or before this day",
+            "schema": {
+              "format": "date",
+              "type": "string"
+            }
+          },
           {
             "name": "sort",
             "required": false,

apps/api/schema.gql

@@ -462,6 +462,12 @@ input IssueFilterInput {
   areas: [String!]
   assigneeId: ID
   categories: [StatusCategory!]
+
+  """Due on or after this day (YYYY-MM-DD)"""
+  dueFrom: String
+
+  """Due on or before this day (YYYY-MM-DD)"""
+  dueTo: String
   labels: [String!]
 
   """Only tickets in no sprint"""

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 */

apps/web/src/app/app.routes.spec.ts

@@ -30,6 +30,7 @@ describe('appRoutes', () => {
       'issues/:issueKey',
       'backlog',
       'sprints',
+      'calendar',
       'roadmap',
       'epics',
       'trash',