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/application/src/lib/events/issue.events.ts

@@ -43,6 +43,7 @@ export const issuePageEvents = eventGroup({
       replyTo?: string | null;
     }>(),
     watchRequested: type<{ issueId: string; watching: boolean }>(),
+    pinRequested: type<{ issueId: string; pinned: boolean }>(),
     trashRequested: type<{ issueId: string; trashed: boolean }>(),
     /** Place the ticket under another one by its key (e.g. WEB-3); null: out. */
     parentRequested: type<{ issueId: string; parentKey: string | null }>(),

libs/web/tracker/application/src/lib/facades/issue.facade.ts

@@ -120,6 +120,13 @@ export class IssueFacade {
     );
   }
 
+  /** Pin the ticket for me (or unpin it): at hand on my home page and in search. */
+  setPinned(pinned: boolean): void {
+    this.withIssue((issueId) =>
+      this.dispatch.pinRequested({ issueId, pinned }),
+    );
+  }
+
   /** Places the open ticket under another one by its key; null: back to the top. */
   /**
    * Tickets to link to or hang the open one from: the most recently updated

libs/web/tracker/application/src/lib/stores/issue.store.ts

@@ -337,6 +337,20 @@ export const IssueStore = signalStore(
                 ),
               ),
             ),
+          events
+            .on(issuePageEvents.pinRequested)
+            .pipe(
+              mergeMap(({ payload }) =>
+                runCommand(
+                  issues.pin(payload.issueId, payload.pinned),
+                  payload.pinned
+                    ? 'Fijado: lo tienes a mano en el inicio y al buscar'
+                    : 'Ya no está fijado',
+                  done,
+                  failed,
+                ),
+              ),
+            ),
           events
             .on(issuePageEvents.watchRequested)
             .pipe(