feat(web): printable report of a sprint or a release

/p/:key/report/(sprint|release)/🆔 what it is, its totals, the release
notes and its tickets by stage. «Imprimir o guardar en PDF» opens the
browser's dialog; on paper the app's header, tabs, tinted panels and
lights are left out. Linked from Sprints and Releases.

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

libs/web/tracker/domain/src/lib/models/inputs.ts

@@ -102,6 +102,7 @@ export interface IssueListFilter {
   assigneeId?: string;
   unassigned?: boolean;
   releaseId?: string;
+  sprintId?: string;
   /** Only tickets holding these custom values. */
   customFields?: CustomFieldValue[];
   limit: number;