feat: sistema de figurinhas, emoji PT-BR e preloader inteligente

- Stickers: captura automática por fileSha256 (Baileys) no MessageHandler,
  tabela Prisma 'stickers' com deduplicação por [tenantId, sha256],
  API REST /api/stickers (list + favorite toggle), cache IndexedDB permanente
  (sem TTL — conteúdo imutável), StickerPanel.tsx com abas Recentes/Favoritos
- Emoji picker: migrado de emoji-picker-react para @emoji-mart/react com
  locale="pt" (tradução completa: categorias, busca, mensagem de sem resultado)
- Preloader: aparece apenas em hard reload (F5/URL direta) via
  performance.getEntriesByType('navigation').type + sessionStorage flag,
  navegação client-side Next.js pula o overlay instantaneamente
- Avatar cache: Wasabi como storage persistente + IndexedDB client-side,
  avatar_version via MD5(avatarUrl) sem coluna extra no banco,
  rota /api/storage/view/* para servir arquivos Wasabi ao frontend

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

clube67/newwhats.local/plugins/UnifiedStorageProvider/index.js

@@ -292,10 +292,11 @@ class UnifiedStorageProviderPlugin {
         }
         const safeBase = originalName.replace(/[^a-zA-Z0-9._-]/g, '_');
         const fileName = `${Date.now()}-${safeBase}`;
-        // Path no bucket: whatsapp/{tenantId}/{instanceId}/{file}  ou  {category}/{file}
-        const relativePath = (category === 'whatsapp' && payload.usuarioSis && payload.sessionJID)
-            ? `whatsapp/${payload.usuarioSis}/${payload.sessionJID}/${fileName}`
-            : `${category}/${fileName}`;
+        // Path no bucket: customPath (quando fornecido) > whatsapp/{t}/{i}/{file} > {cat}/{file}
+        const relativePath = payload.customPath
+            ?? ((category === 'whatsapp' && payload.usuarioSis && payload.sessionJID)
+                ? `whatsapp/${payload.usuarioSis}/${payload.sessionJID}/${fileName}`
+                : `${category}/${fileName}`);
         if (!this.s3 || !this.bucket) {
             return this.saveToLocalFallback(relativePath, buffer, originalName, category);
         }
@@ -317,6 +318,26 @@ class UnifiedStorageProviderPlugin {
             return this.saveToLocalFallback(relativePath, buffer, originalName, category);
         }
     }
+    async getBuffer(relativePath) {
+        // 1. Fallback local
+        const localPath = path_1.default.join(this.localFallbackDir, relativePath);
+        if (fs_1.default.existsSync(localPath)) {
+            return fs_1.default.readFileSync(localPath);
+        }
+        // 2. Wasabi
+        if (!this.s3 || !this.bucket)
+            return null;
+        try {
+            const result = await this.s3.send(new client_s3_1.GetObjectCommand({ Bucket: this.bucket, Key: relativePath }));
+            if (!result.Body)
+                return null;
+            const bytes = await result.Body.transformToByteArray();
+            return Buffer.from(bytes);
+        }
+        catch {
+            return null;
+        }
+    }
     /** Salva buffer no diretório de fallback local, criando subpastas se necessário */
     saveToLocalFallback(relativePath, buffer, originalName, _category) {
         const dest = path_1.default.join(this.localFallbackDir, relativePath);