fix: make the follow button on a ticket work

The store never sent the follow and unfollow requests to the API.

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

libs/web/tracker/application/src/lib/facades/facades.spec.ts

@@ -47,6 +47,7 @@ function gateways() {
       board: vi.fn(() => of([])),
       issue: vi.fn(() => of(issue)),
       changeStatus: vi.fn(() => of(ok)),
+      watch: vi.fn(() => of(ok)),
     },
     list: {
       list: vi.fn(() => of([])),
@@ -233,6 +234,8 @@ describe('IssueFacade', () => {
       status: 'QA_FAILED',
       reason: 'Falla en Safari',
     });
+    issue.setWatching(true);
+    expect(fakes.issues.watch).toHaveBeenCalledWith('i1', true);
   });
 
   it('uploads files one by one, and under a new comment when sent with it', () => {

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

@@ -228,6 +228,20 @@ export const IssueStore = signalStore(
                 ),
               ),
             ),
+          events
+            .on(issuePageEvents.watchRequested)
+            .pipe(
+              mergeMap(({ payload }) =>
+                runCommand(
+                  issues.watch(payload.issueId, payload.watching),
+                  payload.watching
+                    ? 'Ahora sigues este ticket'
+                    : 'Has dejado de seguir este ticket',
+                  done,
+                  failed,
+                ),
+              ),
+            ),
           events
             .on(issuePageEvents.linkRequested)
             .pipe(