feat: «Mi día», the few tickets I pick for today

A home panel with the tickets picked for today (10 at most), crossed out
as they get done and counted («1 de 3 terminados»), my open tickets to
add with one click, and what was left unfinished on my last day to carry
over. «☀ Mi día» on a ticket adds it or takes it out. The day is the
person's own (YYYY-MM-DD from the browser); private, no history (Mongo
`my_days`).

API: myDay(day), addToMyDay, removeFromMyDay; GET /api/me/day,
PUT/DELETE /api/me/day/{issue}. MCP: my_day.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

libs/api/tracker/infrastructure/src/lib/mongo/my-days.repository.ts

@@ -0,0 +1,46 @@
+import { Injectable } from '@nestjs/common';
+import { InjectModel } from '@nestjs/mongoose';
+import {
+  MyDayRecord,
+  MyDaysRepository,
+} from '@task-stream/api/tracker/application';
+import { Model } from 'mongoose';
+import { ReadModels } from './read-model.schemas';
+
+type Stored = MyDayRecord & { _id?: unknown };
+
+const strip = ({ _id: _ignored, ...record }: Stored): MyDayRecord => ({
+  ...record,
+  // Mongo leaves an emptied list out.
+  issueIds: record.issueIds ?? [],
+});
+
+@Injectable()
+export class MongoMyDaysRepository extends MyDaysRepository {
+  constructor(
+    @InjectModel(ReadModels.MyDay) private readonly days: Model<Stored>,
+  ) {
+    super();
+  }
+
+  async find(userId: string, day: string): Promise<MyDayRecord | null> {
+    const doc = await this.days.findOne({ userId, day }).lean<Stored>();
+    return doc ? strip(doc) : null;
+  }
+
+  async latestBefore(userId: string, day: string): Promise<MyDayRecord | null> {
+    const doc = await this.days
+      .findOne({ userId, day: { $lt: day } })
+      .sort({ day: -1 })
+      .lean<Stored>();
+    return doc ? strip(doc) : null;
+  }
+
+  async save(record: MyDayRecord): Promise<void> {
+    await this.days.updateOne(
+      { userId: record.userId, day: record.day },
+      { $set: record },
+      { upsert: true },
+    );
+  }
+}

libs/api/tracker/infrastructure/src/lib/mongo/read-model.schemas.ts

@@ -111,6 +111,7 @@ export const ReadModels = {
   AlertTrace: 'AlertTrace',
   TreeFollow: 'TreeFollow',
   IssueReminder: 'IssueReminder',
+  MyDay: 'MyDay',
   Sprint: 'SprintReadModel',
   GitIntegration: 'GitIntegration',
   OutgoingWebhook: 'OutgoingWebhook',
@@ -385,6 +386,15 @@ export const IssueReminderSchema = SchemaFactory.createForClass(
 IssueReminderSchema.index({ sentAt: 1, at: 1 });
 IssueReminderSchema.index({ userId: 1, issueId: 1 });
 
+@Schema({ ...LOOSE, collection: 'my_days' })
+class MyDayDocument {
+  @Prop({ type: String }) userId!: string;
+  @Prop({ type: String }) day!: string;
+  @Prop({ type: [String] }) issueIds!: string[];
+}
+export const MyDaySchema = SchemaFactory.createForClass(MyDayDocument);
+MyDaySchema.index({ userId: 1, day: -1 }, { unique: true });
+
 @Schema({ ...LOOSE, collection: 'git_integrations' })
 class GitIntegrationDocument {
   /** The project's id. */
@@ -492,6 +502,7 @@ export const READ_MODEL_SCHEMAS = [
   { name: ReadModels.AlertTrace, schema: AlertTraceSchema },
   { name: ReadModels.TreeFollow, schema: TreeFollowSchema },
   { name: ReadModels.IssueReminder, schema: IssueReminderSchema },
+  { name: ReadModels.MyDay, schema: MyDaySchema },
   { name: ReadModels.CalendarFeed, schema: CalendarFeedSchema },
   { name: ReadModels.DashboardShare, schema: DashboardShareSchema },
   { name: ReadModels.PushSubscription, schema: PushSubscriptionSchema },

libs/api/tracker/infrastructure/src/lib/tracker-infrastructure.module.ts

@@ -17,6 +17,7 @@ import {
   AlertIntegrationsRepository,
   TreeFollowsRepository,
   IssueRemindersRepository,
+  MyDaysRepository,
   GitIntegrationsRepository,
   OutgoingWebhooksRepository,
   AutomationsRepository,
@@ -86,6 +87,7 @@ import { MongoPinsRepository } from './mongo/pins.repository';
 import { MongoAlertIntegrationsRepository } from './mongo/alert-integrations.repository';
 import { MongoTreeFollowsRepository } from './mongo/tree-follows.repository';
 import { MongoIssueRemindersRepository } from './mongo/issue-reminders.repository';
+import { MongoMyDaysRepository } from './mongo/my-days.repository';
 import { MongoGitIntegrationsRepository } from './mongo/git-integrations.repository';
 import { MongoOutgoingWebhooksRepository } from './mongo/outgoing-webhooks.repository';
 import { HttpWebhookSender } from './webhooks/http-webhook.sender';
@@ -172,6 +174,7 @@ const PORTS = [
     provide: IssueRemindersRepository,
     useClass: MongoIssueRemindersRepository,
   },
+  { provide: MyDaysRepository, useClass: MongoMyDaysRepository },
   {
     provide: GitIntegrationsRepository,
     useClass: MongoGitIntegrationsRepository,