fix(web): settings and bell use accessible checkboxes, not slide toggles

@pi/ui's slide toggle hides its input with display: none and gives it
no name: neither the Tab key nor a screen reader could reach the
switches in settings (visibility, the public's proposals, the
definition of done, the link for clients) or the bell's (e-mail copy,
notices on this device). They are pi-checkbox now, each with a name
saying what it turns on: reachable by keyboard, toggled with the space
bar and announced.

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

docs/04-cliente-web.md

@@ -291,7 +291,7 @@ visualización de la plataforma:
   lectura, y en uno privado (o inexistente), el enlace para iniciar sesión volviendo a esa página (`returnUrl`).
 - El tiempo real necesita sesión: `GraphqlRealtimeGateway` no abre subscriptions sin token (si lo hiciera, la API
   cerraría el WebSocket y el cliente reintentaría sin fin). Los visitantes anónimos ven los datos al cargar la página.
-- Configuración tiene en General el interruptor «Público» (propietario y admins) y, en Zona peligrosa y solo para el propietario, «Eliminar el
+- Configuración tiene en General la casilla «Proyecto público» (propietario y admins) y, en Zona peligrosa y solo para el propietario, «Eliminar el
   proyecto», que exige escribir la clave. Al borrarlo se vuelve a la portada; si otro lo borra mientras lo tienes
   abierto, la subscription avisa (`ProjectChanged.deleted`) y también se vuelve a la portada.
 

libs/web/tracker/presenters/src/lib/pages/settings.page.ts

@@ -209,17 +209,13 @@ function idFrom(name: string): string {
             }
           </p>
         </div>
-        <label class="ts-switch">
-          <input
-            type="checkbox"
-            role="switch"
+        <pi-checkbox
+          class="ts-toggle"
+          label="Proyecto público"
           [checked]="project.isPublic"
           [disabled]="!facade.canManage()"
-            (change)="facade.setPublic($any($event.target).checked)"
+          (checkedChange)="facade.setPublic($event)"
         />
-          <span class="ts-switch__track" aria-hidden="true"></span>
-          <span>{{ project.isPublic ? 'Público' : 'Privado' }}</span>
-        </label>
       </section>
 
       <section
@@ -245,19 +241,13 @@ function idFrom(name: string): string {
             }
           </p>
         </div>
-        <label class="ts-switch">
-          <input
-            type="checkbox"
-            role="switch"
+        <pi-checkbox
+          class="ts-toggle"
+          label="Formulario abierto"
           [checked]="project.isPublic && project.acceptsProposals"
           [disabled]="!facade.canManage() || !project.isPublic"
-            (change)="facade.setAcceptsProposals($any($event.target).checked)"
+          (checkedChange)="facade.setAcceptsProposals($event)"
         />
-          <span class="ts-switch__track" aria-hidden="true"></span>
-          <span>{{
-            project.isPublic && project.acceptsProposals ? 'Abierto' : 'Cerrado'
-          }}</span>
-        </label>
       </section>
 
       @if (facade.canManage()) {
@@ -464,20 +454,12 @@ function idFrom(name: string): string {
                     medias. El propietario y los admins sí pueden cerrarlo.
                   </p>
                 </div>
-                <label class="ts-switch">
-                  <input
-                    type="checkbox"
-                    role="switch"
+                <pi-checkbox
+                  class="ts-toggle"
+                  label="Exigir la checklist completa"
                   [checked]="!!d.checklistBeforeDone"
-                    (change)="
-                      setChecklistBeforeDone($any($event.target).checked)
-                    "
+                  (checkedChange)="setChecklistBeforeDone($event)"
                 />
-                  <span class="ts-switch__track" aria-hidden="true"></span>
-                  <span>{{
-                    d.checklistBeforeDone ? 'Activada' : 'Desactivada'
-                  }}</span>
-                </label>
               </header>
             </section>
 
@@ -1108,59 +1090,9 @@ function idFrom(name: string): string {
         font-size: 0.8125rem;
       }
     }
-    .ts-switch {
-      display: inline-flex;
-      align-items: center;
-      gap: 0.625rem;
-      font-size: 0.875rem;
+    .ts-toggle {
+      flex: none;
       font-weight: 600;
-      cursor: pointer;
-      input {
-        position: absolute;
-        opacity: 0;
-        width: 1px;
-        height: 1px;
-      }
-      input:focus-visible + .ts-switch__track {
-        outline: 2px solid var(--ts-brand);
-        outline-offset: 2px;
-      }
-      input:disabled ~ * {
-        opacity: 0.6;
-        cursor: default;
-      }
-    }
-    .ts-switch__track {
-      position: relative;
-      width: 2.5rem;
-      height: 1.375rem;
-      border-radius: 999px;
-      background: var(--ts-line-strong);
-      transition: background-color 0.15s ease;
-      &::after {
-        content: '';
-        position: absolute;
-        top: 3px;
-        left: 3px;
-        width: 1rem;
-        height: 1rem;
-        border-radius: 50%;
-        background: var(--ts-surface);
-        box-shadow: var(--ts-shadow);
-        transition: transform 0.15s ease;
-      }
-    }
-    .ts-switch input:checked + .ts-switch__track {
-      background: var(--ts-brand);
-      &::after {
-        transform: translateX(1.125rem);
-      }
-    }
-    .ts-danger {
-      border: 1px solid color-mix(in srgb, var(--ts-c-red) 45%, transparent);
-      h3 {
-        color: var(--ts-c-red);
-      }
     }
     .ts-danger__confirm {
       display: flex;
@@ -1453,12 +1385,6 @@ function idFrom(name: string): string {
       display: grid;
       place-items: center;
     }
-    input[type='checkbox'] {
-      width: 1rem;
-      height: 1rem;
-      accent-color: var(--ts-brand);
-      cursor: pointer;
-    }
     .ts-type-icon {
       display: inline-grid;
       place-items: center;

libs/web/tracker/presenters/src/lib/ui/client-share.ts

@@ -49,17 +49,13 @@ const DEFAULT_BLOCKS: SharedBlock[] = ['flow', 'sprint', 'releases'];
           enseña personas ni tickets sueltos (salvo las épicas).
         </p>
       </div>
-      <label class="ts-switch">
-        <input
-          type="checkbox"
-          role="switch"
+      <pi-checkbox
+        class="ts-toggle"
+        label="Compartir con clientes"
         [checked]="!!sharing.share()"
         [disabled]="!sharing.loaded() || sharing.busy()"
-          (change)="toggle($any($event.target).checked)"
+        (checkedChange)="toggle($event)"
       />
-        <span class="ts-switch__track" aria-hidden="true"></span>
-        <span>{{ sharing.share() ? 'Compartido' : 'Sin compartir' }}</span>
-      </label>
     </div>
 
     @if (sharing.share(); as share) {
@@ -186,53 +182,9 @@ const DEFAULT_BLOCKS: SharedBlock[] = ['flow', 'sprint', 'releases'];
       color: var(--ts-c-red);
       font-size: 0.875rem;
     }
-    .ts-switch {
-      display: inline-flex;
-      align-items: center;
-      gap: 0.625rem;
-      font-size: 0.875rem;
+    .ts-toggle {
+      flex: none;
       font-weight: 600;
-      cursor: pointer;
-      input {
-        position: absolute;
-        opacity: 0;
-        width: 1px;
-        height: 1px;
-      }
-      input:focus-visible + .ts-switch__track {
-        outline: 2px solid var(--ts-brand);
-        outline-offset: 2px;
-      }
-      input:disabled ~ * {
-        opacity: 0.6;
-        cursor: default;
-      }
-    }
-    .ts-switch__track {
-      position: relative;
-      width: 2.5rem;
-      height: 1.375rem;
-      border-radius: 999px;
-      background: var(--ts-line-strong);
-      transition: background-color 0.15s ease;
-      &::after {
-        content: '';
-        position: absolute;
-        top: 3px;
-        left: 3px;
-        width: 1rem;
-        height: 1rem;
-        border-radius: 50%;
-        background: var(--ts-surface);
-        box-shadow: var(--ts-shadow);
-        transition: transform 0.15s ease;
-      }
-    }
-    .ts-switch input:checked + .ts-switch__track {
-      background: var(--ts-brand);
-      &::after {
-        transform: translateX(1.125rem);
-      }
     }
   `,
 })

libs/web/tracker/presenters/src/lib/ui/notifications-bell.ts

@@ -11,7 +11,7 @@ import {
   PiBadgeComponent,
   PiIconButtonComponent,
   PiIconComponent,
-  PiSlideToggleComponent,
+  PiCheckboxComponent,
 } from '@pi/ui';
 import { DrawerService } from '@task-stream/web/shared/ui';
 import { InboxFacade, PushFacade } from '@task-stream/web/tracker/application';
@@ -46,7 +46,7 @@ const ICON: Record<NotificationKind, string> = {
     PiBadgeComponent,
     PiIconButtonComponent,
     PiIconComponent,
-    PiSlideToggleComponent,
+    PiCheckboxComponent,
   ],
   template: `
     <pi-badge
@@ -81,25 +81,19 @@ const ICON: Record<NotificationKind, string> = {
             (execute)="inbox.markRead()"
           />
           @if (inbox.settings()?.emailAvailable) {
-            <div class="ts-inbox__switch">
-              <pi-slide-toggle
+            <pi-checkbox
               label="Copia por correo"
               [checked]="inbox.settings()?.email ?? false"
               (checkedChange)="inbox.setEmail($event)"
             />
-              <span aria-hidden="true">Copia por correo</span>
-            </div>
           }
           @if (inbox.settings()?.pushPublicKey && push.supported) {
-            <div class="ts-inbox__switch">
-              <pi-slide-toggle
+            <pi-checkbox
               label="Avisos en este dispositivo"
               [checked]="push.on()"
               [disabled]="push.busy()"
               (checkedChange)="togglePush($event)"
             />
-              <span aria-hidden="true">Avisos en este dispositivo</span>
-            </div>
           }
         </div>
         @if (push.error(); as error) {
@@ -156,12 +150,6 @@ const ICON: Record<NotificationKind, string> = {
       justify-content: space-between;
       gap: 0.75rem;
     }
-    .ts-inbox__switch {
-      display: inline-flex;
-      gap: 0.5rem;
-      align-items: center;
-      font-size: 0.875rem;
-    }
     .ts-inbox__error {
       margin: 0;
       color: var(--ts-c-red, var(--ts-ink));