feat: saved board views and richer board filters

The board now filters by text, type, priority and unassigned tickets as
well. Any combination can be saved as a named view, private or shared with
the project, and opened again with one click.

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

libs/api/tracker/application/src/lib/ports/index.ts

@@ -20,3 +20,4 @@ export * from './tracker-streams.repository';
 export * from './attachment-storage';
 export * from './notifications.repository';
 export * from './notification-mailer';
+export * from './saved-filters.repository';