#34: fix the mail counters, the reader pane, and the state between surfaces

The counts were computed inline in JSX where nothing could test them. The
sidebar matched a folder by a special-use role folders do not always carry, its
badges were fetched once and then froze - new mail did not raise them and
reading a message did not lower it - and the list header printed the size of
the loaded page, capped at 50, as the size of the folder. The rules now live in
mailCounts.ts behind tests, useFolders keeps them current from the server's
push and from this tab's own changes, and each filter chip carries its number.

Inline images never left the server: RenderMessage dropped every part a body
references as cid:, so mail written by any normal client rendered with broken
icons. They now come back as bounded data URIs, refusing image/svg+xml, and the
reader resolves them, sizes its frame from the message instead of a fixed
500px, and renders on the light surface mail assumes.

Reading mail no longer asks for a second factor - the mailbox is behind the
account's own password - while the console still requires one unconditionally,
now collected by a step-up that does not ask again for the password the session
in hand just proved. An admin sign-in issues the webmail session too, so
leaving the console is a link rather than another login.

Two defects found while testing the above:

  - The admin sign-in checked the password and the second factor and never the
    role, so any account that had enrolled a factor from its own settings could
    obtain an admin-audience session.
  - Session tokens carried nothing that varied below one second, so signing in
    twice within the same second minted the identical token and collided with
    the unique index on web_sessions.refresh_token_hash. A correct password
    answered 500, and a double-clicked sign-in was enough to do it. Tokens now
    carry a jti.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

services/webmail/messages/es.json

@@ -89,11 +89,15 @@
     "genericError": "Algo salió mal",
     "invalidCredentials": "Correo o contraseña inválidos",
     "mfaRequired": "Introduzca el código de seis dígitos de su aplicación de autenticación.",
+    "orRecoveryCode": "¿Perdiste el teléfono? Aquí también sirve un código de recuperación.",
     "passwordLabel": "Contraseña",
     "qrCodeAlt": "Código QR para configurar la verificación en dos pasos",
     "scanQr": "Escanee este código con Google Authenticator, Aegis, Authy o 1Password.",
     "signInButton": "Iniciar sesión",
     "signOutOfAdmin": "Salir de administración",
+    "stepUpIntro": "Ya has iniciado sesión, así que solo hace falta tu segundo factor. No se te pide la contraseña otra vez.",
+    "stepUpSignedInAs": "Sesión iniciada como {email}",
+    "stepUpTitle": "Abrir la consola de administración",
     "totpCodeLabel": "Código de autenticación",
     "userLoginTitle": "Acceda a su buzón",
     "verificationFailed": "Fallo en la verificación",
@@ -145,7 +149,9 @@
     "draftSaved": "Borrador guardado automáticamente",
     "draftSaving": "Guardando borrador...",
     "drafts": "Borradores",
+    "emptyBody": "Este mensaje no tiene cuerpo de texto.",
     "forward": "Reenviar",
+    "imagesEnabled": "Imágenes cargadas",
     "hideCcBcc": "- Ocultar Cc/Cco",
     "inbox": "Bandeja de entrada",
     "insertLink": "Insertar enlace",
@@ -153,9 +159,18 @@
     "italic": "Cursiva",
     "junk": "Spam",
     "loadImages": "Cargar imágenes",
+    "markRead": "Marcar como leído",
+    "markUnread": "Marcar como no leído",
+    "messagesInFolder": "{count} mensajes",
+    "noMatches": "Nada coincide con esa búsqueda",
     "noMessages": "Sin mensajes",
+    "noSubject": "(Sin asunto)",
     "numberedList": "Lista numerada",
+    "remoteContentBlocked": "Se bloquearon las imágenes remotas para que este mensaje no pueda rastrearte.",
     "reply": "Responder",
+    "searchMatches": "{count} encontrados",
+    "searchPlaceholder": "Buscar (from:, subject:)...",
+    "selectAMessage": "Selecciona un mensaje para leerlo",
     "sendMessage": "Enviar mensaje",
     "sending": "Enviando...",
     "sent": "Enviados",
@@ -232,6 +247,7 @@
     "appPasswordsSection": "Contraseñas de aplicación",
     "attempts": "Intentos",
     "bounceRate": "Tasa de rebote",
+    "ccRecipients": "Cc",
     "changePassword": "Cambiar contraseña",
     "clientIp": "IP del cliente",
     "copyPasswordNow": "Cópiela ahora. No se mostrará de nuevo.",