feat: dashboard reads the sprint, the risks, aging and bottlenecks

A new projectInsights reading (GraphQL Project.insights, REST
/projects/{project}/insights, MCP get_project_insights), computed by pure
functions over the read model and the timeline:
- the sprint under way: days left, points done, pace against what is
  needed and whether it gets there;
- tickets at risk: overdue, due within a week, blocked by an open ticket
  and stuck (7 days or more in an in-progress or QA status);
- aging of the work under way against the p85 cycle time;
- average days in each in-progress and QA status, with WIP limits.
The dashboard shows them in four new panels, reloaded on every change.

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

libs/api/tracker/application/src/lib/analytics/analytics.ts

@@ -19,7 +19,7 @@ import {
 const DAY = 86_400_000;
 const STARTED = [StatusCategory.IN_PROGRESS, StatusCategory.QA];
 
-interface Step {
+export interface Step {
   at: number;
   status: string;
   category: StatusCategory;
@@ -63,7 +63,7 @@ function weeks(from: number, to: number): string[] {
 }
 
 /** Status steps per ticket; tickets with no timeline get one from their creation. */
-function stepsByIssue(
+export function stepsByIssue(
   issues: IssueReadModel[],
   timeline: IssueTimelineEntry[],
 ): Map<string, Step[]> {