feat: estimate tickets and see the team's velocity

Story points can be set on the ticket page and when creating a ticket,
and show on cards, column headers, subtasks and the backlog. The Sprints
tab charts the points finished per closed sprint and warns when a planned
sprint holds more than the recent average.

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

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

@@ -114,6 +114,8 @@ export interface IssueSummary {
   parent: IssueParent | null;
   /** Place in the backlog and in its board column (ascending, as text). */
   rank: string;
+  /** Estimate; null when nobody estimated it. */
+  storyPoints: number | null;
   commentCount: number;
   updatedAt: string;
   version: number;
@@ -141,7 +143,6 @@ export interface Issue extends IssueSummary {
   description: string | null;
   reporter: UserRef;
   figmaUrl: string | null;
-  storyPoints: number | null;
   dueDate: string | null;
   links: IssueLink[];
   attachments: Attachment[];