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/web/tracker/domain/src/lib/ports/gateways.ts

@@ -5,6 +5,8 @@ import {
   BoardColumn,
   Comment,
   Epic,
+  SavedFilter,
+  SavedFilterCriteria,
   CommandResult,
   Issue,
   IssuePage,
@@ -124,6 +126,18 @@ export abstract class IssuesGateway {
   ): Observable<CommandResult>;
 }
 
+/** Saved views of a project's board (mine and the shared ones). */
+export abstract class SavedFiltersGateway {
+  abstract list(projectId: string): Observable<SavedFilter[]>;
+  abstract save(input: {
+    projectId: string;
+    name: string;
+    shared: boolean;
+    criteria: SavedFilterCriteria;
+  }): Observable<string>;
+  abstract remove(id: string): Observable<void>;
+}
+
 export abstract class CommentsGateway {
   abstract list(issueId: string): Observable<Comment[]>;
   abstract add(issueId: string, body: string): Observable<CommandResult>;