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/presenters/src/lib/pages/board.page.scss

@@ -182,3 +182,8 @@
 .ts-column--lane .ts-column__list {
   min-height: 3.5rem;
 }
+
+.ts-template-hint {
+  margin: -0.25rem 0 0;
+  font-size: 0.8125rem;
+}