feat: a calendar to subscribe to, and the backlog's corners

- Each person can subscribe their dates in Google Calendar, Outlook or
  Apple Calendar: GET /api/calendar/{token}.ics (no session) brings
  their unfinished tickets with a due date (assigned or followed), the
  planned and running sprints and the planned releases of their
  projects, as all-day events linking to the web. The token is made,
  renewed or dropped under /me/calendar (and in GraphQL); in the web,
  from «Calendario» in «Mi trabajo».
- The backlog panel keeps the selected rows' background inside its
  rounded corners.

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

libs/web/tracker/infrastructure/src/lib/adapters/graphql-calendar.gateway.ts

@@ -0,0 +1,48 @@
+import { inject, Injectable } from '@angular/core';
+import { API_CONFIG } from '@task-stream/web/shared/infrastructure';
+import { CalendarFeed, CalendarGateway } from '@task-stream/web/tracker/domain';
+import { map, Observable } from 'rxjs';
+import {
+  CreateCalendarFeedDocument,
+  MyCalendarFeedDocument,
+  RevokeCalendarFeedDocument,
+} from '../graphql/generated';
+import { GraphqlOperations } from './graphql-operations';
+
+@Injectable()
+export class GraphqlCalendarGateway extends CalendarGateway {
+  private readonly gql = inject(GraphqlOperations);
+  private readonly api = inject(API_CONFIG);
+
+  mine(): Observable<CalendarFeed | null> {
+    return this.gql
+      .query(MyCalendarFeedDocument)
+      .pipe(
+        map((d) => (d.myCalendarFeed ? this.toFeed(d.myCalendarFeed) : null)),
+      );
+  }
+
+  create(): Observable<CalendarFeed> {
+    return this.gql
+      .mutate(CreateCalendarFeedDocument, {})
+      .pipe(map((d) => this.toFeed(d.createCalendarFeed)));
+  }
+
+  revoke(): Observable<void> {
+    return this.gql
+      .mutate(RevokeCalendarFeedDocument, {})
+      .pipe(map(() => undefined));
+  }
+
+  /** The API answers the secret; calendar apps need the whole address. */
+  private toFeed(feed: { token: string; createdAt: string }): CalendarFeed {
+    const base = new URL(
+      this.api.restUrl.replace(/\/+$/, '') + '/',
+      location.origin,
+    );
+    return {
+      url: new URL(`calendar/${feed.token}.ics`, base).toString(),
+      createdAt: feed.createdAt,
+    };
+  }
+}

libs/web/tracker/infrastructure/src/lib/graphql/calendar.graphql

@@ -0,0 +1,17 @@
+query MyCalendarFeed {
+  myCalendarFeed {
+    token
+    createdAt
+  }
+}
+
+mutation CreateCalendarFeed {
+  createCalendarFeed {
+    token
+    createdAt
+  }
+}
+
+mutation RevokeCalendarFeed {
+  revokeCalendarFeed
+}

libs/web/tracker/infrastructure/src/lib/graphql/generated.ts

@@ -438,6 +438,26 @@ export type DeleteAutomationMutationVariables = Exact<{
 
 export type DeleteAutomationMutation = { deleteAutomation: boolean };
 
+export type MyCalendarFeedQueryVariables = Exact<{ [key: string]: never }>;
+
+export type MyCalendarFeedQuery = {
+  myCalendarFeed: { token: string; createdAt: string } | null;
+};
+
+export type CreateCalendarFeedMutationVariables = Exact<{
+  [key: string]: never;
+}>;
+
+export type CreateCalendarFeedMutation = {
+  createCalendarFeed: { token: string; createdAt: string };
+};
+
+export type RevokeCalendarFeedMutationVariables = Exact<{
+  [key: string]: never;
+}>;
+
+export type RevokeCalendarFeedMutation = { revokeCalendarFeed: boolean };
+
 export type UserRefFieldsFragment = { id: string; name: string };
 
 export type ProjectFieldsFragment = {
@@ -3796,6 +3816,83 @@ export const DeleteAutomationDocument = {
   DeleteAutomationMutation,
   DeleteAutomationMutationVariables
 >;
+export const MyCalendarFeedDocument = {
+  kind: 'Document',
+  definitions: [
+    {
+      kind: 'OperationDefinition',
+      operation: 'query',
+      name: { kind: 'Name', value: 'MyCalendarFeed' },
+      selectionSet: {
+        kind: 'SelectionSet',
+        selections: [
+          {
+            kind: 'Field',
+            name: { kind: 'Name', value: 'myCalendarFeed' },
+            selectionSet: {
+              kind: 'SelectionSet',
+              selections: [
+                { kind: 'Field', name: { kind: 'Name', value: 'token' } },
+                { kind: 'Field', name: { kind: 'Name', value: 'createdAt' } },
+              ],
+            },
+          },
+        ],
+      },
+    },
+  ],
+} as unknown as DocumentNode<MyCalendarFeedQuery, MyCalendarFeedQueryVariables>;
+export const CreateCalendarFeedDocument = {
+  kind: 'Document',
+  definitions: [
+    {
+      kind: 'OperationDefinition',
+      operation: 'mutation',
+      name: { kind: 'Name', value: 'CreateCalendarFeed' },
+      selectionSet: {
+        kind: 'SelectionSet',
+        selections: [
+          {
+            kind: 'Field',
+            name: { kind: 'Name', value: 'createCalendarFeed' },
+            selectionSet: {
+              kind: 'SelectionSet',
+              selections: [
+                { kind: 'Field', name: { kind: 'Name', value: 'token' } },
+                { kind: 'Field', name: { kind: 'Name', value: 'createdAt' } },
+              ],
+            },
+          },
+        ],
+      },
+    },
+  ],
+} as unknown as DocumentNode<
+  CreateCalendarFeedMutation,
+  CreateCalendarFeedMutationVariables
+>;
+export const RevokeCalendarFeedDocument = {
+  kind: 'Document',
+  definitions: [
+    {
+      kind: 'OperationDefinition',
+      operation: 'mutation',
+      name: { kind: 'Name', value: 'RevokeCalendarFeed' },
+      selectionSet: {
+        kind: 'SelectionSet',
+        selections: [
+          {
+            kind: 'Field',
+            name: { kind: 'Name', value: 'revokeCalendarFeed' },
+          },
+        ],
+      },
+    },
+  ],
+} as unknown as DocumentNode<
+  RevokeCalendarFeedMutation,
+  RevokeCalendarFeedMutationVariables
+>;
 export const GitIntegrationDocument = {
   kind: 'Document',
   definitions: [

libs/web/tracker/infrastructure/src/lib/tracker-infrastructure.providers.ts

@@ -9,6 +9,7 @@ import {
   CommentsGateway,
   IssuesGateway,
   NotificationsGateway,
+  CalendarGateway,
   ProjectsGateway,
   ReleasesGateway,
   SavedFiltersGateway,
@@ -28,6 +29,7 @@ import {
 } from './adapters/graphql-collaboration.gateways';
 import { GraphqlIssuesGateway } from './adapters/graphql-issues.gateway';
 import { GraphqlNotificationsGateway } from './adapters/graphql-notifications.gateway';
+import { GraphqlCalendarGateway } from './adapters/graphql-calendar.gateway';
 import { HttpAttachmentsGateway } from './adapters/http-attachments.gateway';
 import { HttpProposalsGateway } from './adapters/http-proposals.gateway';
 import { GraphqlProjectsGateway } from './adapters/graphql-projects.gateway';
@@ -51,6 +53,7 @@ export function provideTrackerInfrastructure(): EnvironmentProviders {
     { provide: ProposalsGateway, useClass: HttpProposalsGateway },
     { provide: UsersGateway, useClass: GraphqlUsersGateway },
     { provide: NotificationsGateway, useClass: GraphqlNotificationsGateway },
+    { provide: CalendarGateway, useClass: GraphqlCalendarGateway },
     { provide: TrackerRealtimeGateway, useClass: GraphqlRealtimeGateway },
     { provide: SavedFiltersGateway, useClass: GraphqlSavedFiltersGateway },
     { provide: SprintsGateway, useClass: GraphqlSprintsGateway },