feat: pinned tickets, at hand on the home page and in search

Each person pins up to 20 tickets from the ticket's page («Fijar»). They
show as a strip under the projects on the home page and in the search
palette before typing. Private and without history, like the views of
«my work» (Mongo `pinned_issues`); tickets in the trash or out of reach
are left out, and when the list is full the unreadable ones are dropped
first.

API: GET /api/me/pins, PUT/DELETE /api/issues/{issue}/pin; GraphQL
myPins, pinIssue, unpinIssue and Issue.pinned.

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

libs/web/tracker/presenters/src/lib/pages/projects.page.ts

@@ -53,6 +53,7 @@ import { ResumeComponent } from '../ui/home/resume';
 import { WeekAgendaComponent } from '../ui/home/week-agenda';
 import { HomeKpisComponent } from '../ui/home/kpis';
 import { MyViewsComponent } from '../ui/my-views';
+import { PinnedComponent } from '../ui/home/pinned';
 
 /** How often the home page refreshes its reading while open. */
 const REFRESH_MS = 60_000;
@@ -75,6 +76,7 @@ const REFRESH_MS = 60_000;
     WeekAgendaComponent,
     HomeKpisComponent,
     MyViewsComponent,
+    PinnedComponent,
     PiActionButtonComponent,
     PiEmptyStateComponent,
     PiSkeletonComponent,
@@ -155,6 +157,7 @@ const REFRESH_MS = 60_000;
     </section>
 
     @if (facade.projects().length) {
+      <ts-pinned />
       @if (myHome.home(); as h) {
         <ts-home-kpis
           [mine]="home.mineTotal()"
@@ -271,6 +274,7 @@ const REFRESH_MS = 60_000;
       margin-bottom: 2rem;
     }
     ts-first-steps,
+    ts-pinned,
     ts-home-kpis,
     ts-week-agenda,
     ts-my-views {