feat: dashboard forecasts releases, tells what changed and weighs the load

The insights reading grows (GraphQL insights(since:), REST ?since=, MCP):
- planned releases with a likely (p50) and safe (p85) finish date from a
  Monte Carlo over the last six weeks of finished work, one after another,
  and a verdict against their target;
- with `since` (the viewer's last visit, kept in the browser): tickets
  created, finished and sent back from QA, and their mentions;
- each person's open points against what they closed per sprint lately;
- open tickets without estimate, area or assignee, or untouched for 90
  days, each count opening the list filtered (new noEstimate, noArea and
  updatedBefore filters).

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

libs/web/tracker/domain/src/lib/ports/gateways.ts

@@ -64,8 +64,11 @@ export abstract class ProjectsGateway {
   abstract publicProjects(): Observable<Project[]>;
   abstract project(idOrKey: string): Observable<Project>;
   abstract stats(projectId: string): Observable<ProjectStats>;
-  /** Sprint under way, risks, aging and bottlenecks (the dashboard). */
-  abstract insights(projectId: string): Observable<ProjectInsights>;
+  /** The dashboard; with `since`, also what changed after it. */
+  abstract insights(
+    projectId: string,
+    since: string | null,
+  ): Observable<ProjectInsights>;
   /** Statistics of the last `days` days. */
   abstract analytics(
     projectId: string,