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';

libs/api/tracker/application/src/lib/ports/saved-filters.repository.ts

@@ -0,0 +1,14 @@
+import { SavedFilterReadModel } from '@task-stream/api/tracker/domain';
+
+/** Saved board views: per person (or shared with a project), no history. */
+export abstract class SavedFiltersRepository {
+  /** Whoever's own views of the project, then the shared ones, by name. */
+  abstract findVisible(
+    projectId: string,
+    userId: string,
+  ): Promise<SavedFilterReadModel[]>;
+  abstract findById(id: string): Promise<SavedFilterReadModel | null>;
+  abstract countOwned(projectId: string, userId: string): Promise<number>;
+  abstract insert(filter: SavedFilterReadModel): Promise<void>;
+  abstract delete(id: string): Promise<void>;
+}