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/web/tracker/domain/src/index.ts

@@ -7,3 +7,4 @@ export * from './lib/models/mentions';
 export * from './lib/models/hierarchy';
 export * from './lib/models/views';
 export * from './lib/models/estimation';
+export * from './lib/models/swimlanes';