feat: templates per ticket type

Each ticket type can carry a starting description and a checklist, edited
in the project settings. New tickets of that type get the description
when they come without one and always get the checklist; the new ticket
form says what the template will add.

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

libs/web/tracker/infrastructure/src/lib/graphql/fragments.graphql

@@ -40,6 +40,10 @@ fragment ProjectFields on Project {
       icon
       color
       archived
+      template {
+        description
+        checklist
+      }
     }
     areas {
       id