feat: definition of done per project

A project can ask that tickets reach a DONE status only with their
checklist ticked (settings.checklistBeforeDone, off by default; absent
when saving means unchanged). Members get a 422 telling how many steps are
left; owners and admins may still close it. Settings has the switch and
the ticket's checklist says when the project asks for it.

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

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

@@ -268,6 +268,14 @@ const MAX_FILE_BYTES = 25 * 1024 * 1024;
                 >
               }
             </h2>
+            @if (
+              project.workflow().settings.checklistBeforeDone &&
+              facade.checklistProgress().done < facade.checklistProgress().total
+            ) {
+              <p class="ts-checklist__rule">
+                Este proyecto pide marcarla entera antes de darlo por hecho.
+              </p>
+            }
             @if (issue.checklist.length) {
               <ul class="ts-checklist">
                 @for (item of issue.checklist; track item.id) {