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/infrastructure/src/lib/mongo/read-model.schemas.ts

@@ -7,6 +7,7 @@ import {
   IssueTimelineEntry,
   ProjectReadModel,
   ReleaseReadModel,
+  SavedFilterReadModel,
   implicitRank,
 } from '@task-stream/api/tracker/domain';
 import { Schema } from 'mongoose';
@@ -26,6 +27,7 @@ export type ReleaseDoc = Doc<ReleaseReadModel>;
 export type ActivityDoc = Doc<ActivityReadModel>;
 export type TimelineDoc = Doc<IssueTimelineEntry>;
 export type NotificationDoc = Doc<NotificationReadModel>;
+export type SavedFilterDoc = Doc<SavedFilterReadModel>;
 export interface NotificationSettingsDoc {
   _id: string;
   email: boolean;
@@ -40,6 +42,7 @@ export const ReadModels = {
   Timeline: 'IssueTimelineReadModel',
   Notification: 'NotificationReadModel',
   NotificationSettings: 'NotificationSettings',
+  SavedFilter: 'SavedFilter',
 } as const;
 
 const userRef = { _id: false, id: String, name: String };
@@ -160,6 +163,20 @@ export const NotificationSettingsSchema = new Schema<NotificationSettingsDoc>(
   { ...loose, collection: 'notification_settings' },
 );
 
+export const SavedFilterSchema = new Schema<SavedFilterDoc>(
+  {
+    _id: String,
+    projectId: String,
+    owner: userRef,
+    name: String,
+    shared: Boolean,
+    createdAt: String,
+  },
+  { ...loose, collection: 'saved_filters' },
+);
+SavedFilterSchema.index({ projectId: 1, 'owner.id': 1 });
+SavedFilterSchema.index({ projectId: 1, shared: 1 });
+
 export const READ_MODEL_SCHEMAS = [
   { name: ReadModels.Project, schema: ProjectSchema },
   { name: ReadModels.Issue, schema: IssueSchema },
@@ -169,6 +186,7 @@ export const READ_MODEL_SCHEMAS = [
   { name: ReadModels.Timeline, schema: TimelineSchema },
   { name: ReadModels.Notification, schema: NotificationSchema },
   { name: ReadModels.NotificationSettings, schema: NotificationSettingsSchema },
+  { name: ReadModels.SavedFilter, schema: SavedFilterSchema },
 ];
 
 export function fromDoc<T extends { _id: string }>(