feat: teams within a project

Projects keep teams of members in their settings (settings.teams; people
outside the project are dropped, teams are archived, not removed; absent
when saving means unchanged). Tickets go to a team (`team`, also filtered
in the list and in MCP search_issues), and a comment mentioning
@[Frontend](team-FRONT) tells each of its members. Settings has the teams
with their members, the ticket a «Equipo» select, the list a team filter,
and «@» offers the teams after the people.

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

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

@@ -854,6 +854,16 @@ const MAX_FILE_BYTES = 25 * 1024 * 1024;
           >
             <pi-label>Área</pi-label>
           </pi-select-field>
+          @if (teamOptions().length > 1) {
+            <pi-select-field
+              [options]="teamOptions()"
+              [disabled]="!project.canContribute()"
+              [value]="issue.team ?? ''"
+              (valueChange)="update({ team: $any($event || null) })"
+            >
+              <pi-label>Equipo</pi-label>
+            </pi-select-field>
+          }
           @for (field of customFields(); track field.id) {
             <ts-custom-field
               [field]="field"
@@ -1076,6 +1086,18 @@ export class IssuePage {
         .map((t) => ({ value: t.id, label: t.name }));
     },
   );
+  protected readonly teamOptions = computed<PiSelectFieldOption<string>[]>(
+    () => {
+      const current = this.facade.issue()?.team;
+      return [
+        { value: NONE, label: 'Sin equipo' },
+        ...this.project
+          .workflow()
+          .settings.teams.filter((t) => !t.archived || t.id === current)
+          .map((t) => ({ value: t.id, label: t.name })),
+      ];
+    },
+  );
   protected readonly areaOptions = computed<PiSelectFieldOption<string>[]>(
     () => {
       const workflow = this.project.workflow();
@@ -1164,9 +1186,7 @@ export class IssuePage {
   protected readonly pasteImage: ImageUploader = (file) =>
     this.facade.uploadImage(file);
   /** Who `@` offers in what is written here. */
-  protected readonly mentionable = computed(() =>
-    this.project.members().map((m) => m.user),
-  );
+  protected readonly mentionable = this.project.mentionable;
   /** Pull requests first, then the newest. */
   protected readonly devLinks = computed(() =>
     [...(this.facade.issue()?.devLinks ?? [])].sort(
@@ -1332,6 +1352,7 @@ export class IssuePage {
     type?: string;
     priority?: IssuePriority;
     area?: string | null;
+    team?: string | null;
     storyPoints?: number | null;
     startDate?: string | null;
     dueDate?: string | null;