feat(web): a home page in two columns, with four figures on top

The home page was two grids of panels side by side, each row as tall as
its tallest panel, which left gaps. Now: four figures of the same size
(my open tickets, waiting for QA, finished by me and by the team this
week), the week, my views, and two columns that stack on their own: my
tickets and the latest on the left; sprints, QA, following, releases,
who is online and «Retomar» on the right. Project cards are as tall as
their row, with the team at the bottom, and a phone only lists the
days of the week that have something.

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

libs/web/tracker/presenters/src/lib/ui/home/week-agenda.ts

@@ -32,7 +32,7 @@ const KIND: Record<AgendaItem['kind'], string> = {
     </header>
     <ol class="ts-agenda">
       @for (day of days(); track day.date) {
-        <li [class.is-today]="day.today">
+        <li [class.is-today]="day.today" [class.is-empty]="!day.items.length">
           <p class="ts-agenda__day">
             <span>{{ day.weekday }}</span> <strong>{{ day.number }}</strong>
           </p>
@@ -128,6 +128,10 @@ const KIND: Record<AgendaItem['kind'], string> = {
         li {
           min-height: 0;
         }
+        /* On a phone, only the days with something (and today). */
+        li.is-empty:not(.is-today) {
+          display: none;
+        }
       }
     }
   `,