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/api/tracker/presenters/src/lib/common/settings.ts

@@ -23,6 +23,7 @@ export interface SettingsPayload {
     icon: string;
     color: string;
     archived: boolean;
+    template?: { description?: string | null; checklist?: string[] } | null;
   }[];
   areas: { id: string; name: string; archived: boolean }[];
 }
@@ -47,10 +48,18 @@ export function fromSettingsPayload(payload: SettingsPayload): ProjectSettings {
     transitions: Object.fromEntries(
       payload.transitions.map((t) => [t.from, t.to]),
     ),
-    issueTypes: payload.issueTypes.map((t) => ({
+    issueTypes: payload.issueTypes.map(({ template, ...t }) => ({
       ...t,
       icon: t.icon as TypeIcon,
       color: t.color as SettingColor,
+      ...(template
+        ? {
+            template: {
+              description: template.description ?? null,
+              checklist: template.checklist ?? [],
+            },
+          }
+        : {}),
     })),
     areas: payload.areas,
   };