feat: work-in-progress limits and swimlanes on the board

Each status can carry a WIP limit in the project settings; the board shows
it next to the count, marks a column that goes over it and says so when a
card is dropped there. The board can also be grouped in rows by person,
epic, priority or type, remembered per browser.

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

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

@@ -14,6 +14,7 @@ export interface SettingsPayload {
     color: string;
     requiresReason: boolean;
     archived: boolean;
+    wipLimit?: number | null;
   }[];
   transitions: { from: string; to: string[] }[];
   issueTypes: {