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>

apps/mcp/src/app/tools/issues.resolver.ts

@@ -783,6 +783,50 @@ export class IssuesResolver {
     );
   }
 
+  @Tool({
+    name: 'my_day',
+    description:
+      '«Mi día»: the tickets I picked for today (done ones marked), and what was left unfinished on my last day. Optionally add or remove one first. day is today in my time zone, YYYY-MM-DD.',
+    paramsSchema: z.object({
+      day: z.string().regex(/^\d{4}-\d{2}-\d{2}$/),
+      add: issueRef.optional(),
+      remove: issueRef.optional(),
+    }),
+    annotations: WRITE,
+  })
+  myDay(
+    params: { day: string; add?: string; remove?: string },
+    ctx: McpContext,
+  ) {
+    const client = this.api.as(ctx);
+    const query = { day: params.day };
+    return toolResult(async () => {
+      if (params.add)
+        await this.api.data(
+          client.PUT('/api/me/day/{issue}', {
+            params: { path: { issue: params.add }, query },
+          }),
+        );
+      if (params.remove)
+        await this.api.data(
+          client.DELETE('/api/me/day/{issue}', {
+            params: { path: { issue: params.remove }, query },
+          }),
+        );
+      const myDay = await this.api.data(
+        client.GET('/api/me/day', { params: { query } }),
+      );
+      return {
+        day: myDay.day,
+        issues: myDay.issues.map(issueLine),
+        leftover: myDay.leftover && {
+          day: myDay.leftover.day,
+          issues: myDay.leftover.issues.map(issueLine),
+        },
+      };
+    });
+  }
+
   @Tool({
     name: 'remind_me',
     description: