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/index.ts

@@ -9,4 +9,6 @@ export * from './lib/changes.service';
 export * from './lib/workflows.service';
 export * from './lib/notifications.service';
 export * from './lib/notifications';
+export * from './lib/saved-filters.service';
+export * from './lib/saved-filters/saved-filters';
 export * from './lib/tracker-application.module';