feat: archive a project instead of deleting it

The owner archives a finished project (archiveProject, POST
/projects/{project}/archive) and brings it back (unarchive). While
archived it stays readable, managers still read its rules and webhooks,
but no command changes it: contributing and managing checks refuse with
422, votes and public proposals too, and automations do not run. The web
shows a read-only notice on every page of it (with «Desarchivar» for the
owner), hides what edits, marks it on the home page and lists it last.

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

libs/web/tracker/application/src/lib/events/project.events.ts

@@ -51,6 +51,7 @@ export const projectPageEvents = eventGroup({
     analyticsRequested: type<{ projectId: string; days: number }>(),
     burnupRequested: type<{ releaseId: string }>(),
     visibilityChangeRequested: type<{ projectId: string; isPublic: boolean }>(),
+    archiveRequested: type<{ projectId: string; archived: boolean }>(),
     proposalsChangeRequested: type<{
       projectId: string;
       acceptsProposals: boolean;

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

@@ -162,6 +162,12 @@ export class ProjectFacade {
       this.dispatch.visibilityChangeRequested({ projectId, isPublic });
   }
 
+  /** Archives the project (read-only for everyone) or brings it back. Owner only. */
+  setArchived(archived: boolean): void {
+    const projectId = this.projectId();
+    if (projectId) this.dispatch.archiveRequested({ projectId, archived });
+  }
+
   /** Take bug reports and ideas from anyone (while public). Owners and admins. */
   setAcceptsProposals(acceptsProposals: boolean): void {
     const projectId = this.projectId();

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

@@ -100,11 +100,17 @@ export const ProjectStore = signalStore(
     );
     return {
       myRole,
+      /** Archived projects are read-only for everyone. */
       canManage: computed(
-        () => myRole() === ProjectRole.OWNER || myRole() === ProjectRole.ADMIN,
+        () =>
+          !project()?.archivedAt &&
+          (myRole() === ProjectRole.OWNER || myRole() === ProjectRole.ADMIN),
       ),
       canContribute: computed(
-        () => !!myRole() && myRole() !== ProjectRole.VIEWER,
+        () =>
+          !project()?.archivedAt &&
+          !!myRole() &&
+          myRole() !== ProjectRole.VIEWER,
       ),
       members: computed(() => project()?.members ?? []),
       /** Statuses, types and areas of the project, with lookups. */
@@ -433,6 +439,20 @@ export const ProjectStore = signalStore(
                 ),
               ),
             ),
+          events
+            .on(projectPageEvents.archiveRequested)
+            .pipe(
+              mergeMap(({ payload }) =>
+                runCommand(
+                  projects.setArchived(payload.projectId, payload.archived),
+                  payload.archived
+                    ? 'Proyecto archivado: queda en solo lectura'
+                    : 'Proyecto desarchivado',
+                  projectApiEvents.commandSucceeded,
+                  projectApiEvents.commandFailed,
+                ),
+              ),
+            ),
           events
             .on(projectPageEvents.proposalsChangeRequested)
             .pipe(

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

@@ -39,8 +39,13 @@ export const ProjectsStore = signalStore(
     error: null,
   }),
   withComputed(({ projects }) => ({
+    /** By name, archived ones last. */
     sorted: computed(() =>
-      [...projects()].sort((a, b) => a.name.localeCompare(b.name)),
+      [...projects()].sort(
+        (a, b) =>
+          Number(!!a.archivedAt) - Number(!!b.archivedAt) ||
+          a.name.localeCompare(b.name),
+      ),
     ),
   })),
   withReducer(