feat(web): English paths, and a portfolio that updates itself

/cartera, /explorar and /p/:key/proponer are /portfolio, /explore and
/p/:key/propose now, like every other path; the Spanish ones redirect,
so links already shared keep working. Settings sections go by
?section= with English names.

The portfolio reads itself again, quietly, when a ticket, sprint or
release of the projects shown changes, when my projects change, or when
the live connection comes back; «En directo» replaces the refresh
button.

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

libs/web/identity/presenters/src/lib/pages/login.page.ts

@@ -113,7 +113,7 @@ const SAMPLE_FEED = [
         </p>
         <p class="ts-login__explore">
           ¿Solo quieres mirar?
-          <a routerLink="/explorar">Proyectos públicos →</a>
+          <a routerLink="/explore">Proyectos públicos →</a>
         </p>
         <div class="ts-feed ts-panel" aria-hidden="true">
           <div class="ts-feed__track">