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/application/src/lib/events/board.events.ts

@@ -6,6 +6,7 @@ import {
   CommandResult,
   CreateIssueInput,
   IssueChanged,
+  SavedFilter,
 } from '@task-stream/web/tracker/domain';
 
 export const boardPageEvents = eventGroup({
@@ -20,6 +21,9 @@ export const boardPageEvents = eventGroup({
       reason?: string | null;
     }>(),
     issueCreateRequested: type<CreateIssueInput>(),
+    /** Save the current filter under a name. */
+    viewSaveRequested: type<{ name: string; shared: boolean }>(),
+    viewDeleteRequested: type<{ id: string }>(),
   },
 });
 
@@ -31,6 +35,10 @@ export const boardApiEvents = eventGroup({
     issueMoveFailed: type<string>(),
     issueCreated: type<CommandResult>(),
     issueCreateFailed: type<string>(),
+    viewsLoaded: type<SavedFilter[]>(),
+    viewSaved: type<string>(),
+    viewDeleted: type<string>(),
+    viewFailed: type<string>(),
   },
 });