feat(newwhats): frontend do plugin (Inbox/Sessions/Secretária) em tela cheia

- /wa-inbox, /wa-sessions e /wa-secretaria rodam sem a sidebar do scoreodonto
  (isStandaloneView); cada tela tem seu "Voltar" (Secretária ganhou botão na ThinNav).
- SessionsView: banner "Você já possui acesso ao WhatsApp" quando há sessão ativa.
- avatares: usa a URL do CDN (contactAvatarUrl/instance.avatar) direto; Avatar
  exibe sem depender de version; self-heal no onError re-busca a foto atual.
- deps: framer-motion, immer. Dev override com HMR (docker-compose.dev.yml).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/views/newwhats/components/ui/Toast.tsx

@@ -0,0 +1,35 @@
+import React from 'react';
+import { motion, AnimatePresence } from 'framer-motion';
+import { Check, AlertCircle } from 'lucide-react';
+
+interface ToastProps {
+  message: string;
+  type: 'success' | 'error';
+  visible: boolean;
+}
+
+export default function Toast({ message, type, visible }: ToastProps) {
+  return (
+    <AnimatePresence>
+      {visible && (
+        <motion.div
+          initial={{ opacity: 0, x: 40 }}
+          animate={{ opacity: 1, x: 0 }}
+          exit={{ opacity: 0, x: 40 }}
+          className={`
+            fixed top-6 right-6 z-[300] flex items-center gap-3 px-5 py-3.5 rounded-2xl
+            glass-elevated shadow-premium text-sm font-semibold text-white
+            ${type === 'success' ? 'border-l-4 border-l-emerald-500' : 'border-l-4 border-l-red-500'}
+          `}
+        >
+          {type === 'success' ? (
+            <Check className="w-4 h-4 text-emerald-400" />
+          ) : (
+            <AlertCircle className="w-4 h-4 text-red-400" />
+          )}
+          {message}
+        </motion.div>
+      )}
+    </AnimatePresence>
+  );
+}