Feat: UI/UX y Procesos

src/Backend/WhatsappPromo.Core/Services/ConfigService.cs

@@ -17,7 +17,7 @@ namespace WhatsappPromo.Core.Services
     {
         private readonly string _configPath;
         private readonly ILogger<ConfigService> _logger;
-        private SystemConfig _cachedConfig;
+        private SystemConfig? _cachedConfig;
 
         public ConfigService(ILogger<ConfigService> logger)
         {

src/Backend/WhatsappPromo.Core/WhatsappPromo.Core.csproj

@@ -7,8 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="9.0.0" />
-    <PackageReference Include="System.Text.Json" Version="9.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="9.0.2" />
   </ItemGroup>
 
 </Project>

src/Backend/WhatsappPromo.Engine/Services/BrowserService.cs

@@ -13,7 +13,7 @@ namespace WhatsappPromo.Engine.Services
         Task InitializeAsync();
         Task<Page> GetPageAsync();
         Task CloseAsync();
-        Task<string> GetQrCodeAsync(); 
+        Task<string?> GetQrCodeAsync(); 
         Task PerformHumanIdleActionsAsync();
     }
 
@@ -32,185 +32,103 @@ namespace WhatsappPromo.Engine.Services
 
         public async Task InitializeAsync()
         {
+            if (_browser != null && !_browser.IsClosed) return;
+
             _logger.LogInformation("Descargando navegador si es necesario...");
             var browserFetcher = new BrowserFetcher();
             await browserFetcher.DownloadAsync();
 
             var options = new LaunchOptions
             {
-                Headless = false, // Headless mode aumenta riesgo de detección
+                Headless = false,
                 UserDataDir = _userDataDir,
                 Args = new[]
                 {
                     "--no-sandbox",
                     "--disable-setuid-sandbox",
                     "--disable-infobars",
+                    "--start-minimized",
                     "--window-position=0,0",
                     "--ignore-certificate-errors",
                     "--ignore-certificate-errors-spki-list",
-                    
-                    // ANTI-DETECCIÓN CRÍTICA
                     "--disable-blink-features=AutomationControlled",
-                    
-                    // Evitar detección de DevTools
                     "--disable-dev-shm-usage",
-                    
-                    // Hacer que el navegador parezca más "normal"
                     "--disable-extensions-except",
                     "--disable-extensions",
-                    
-                    // GPU y WebGL realistas (importante para huellas digitales)
                     "--enable-webgl",
                     "--use-gl=swiftshader",
+                    "--disable-features=IsolateOrigins,site-per-process,CalculateNativeWinOcclusion",
+                    "--disable-default-apps",
                     
-                    // Deshabilitar características que revelan automatización
-                    "--disable-features=IsolateOrigins,site-per-process",
-                    
-                    // Evitar leaks de automatización
-                    "--disable-default-apps"
+                    // Flags para evitar que el navegador se "duerma" al estar minimizado
+                    "--disable-backgrounding-occluded-windows",
+                    "--disable-background-timer-throttling",
+                    "--disable-renderer-backgrounding"
                 },
-                IgnoredDefaultArgs = new[] { "--enable-automation" }, // Quita "Chrome is being controlled"
-                DefaultViewport = null // Permite que el viewport sea controlado por window size
+                IgnoredDefaultArgs = new[] { "--enable-automation" },
+                DefaultViewport = null
             };
 
             _logger.LogInformation("Iniciando navegador Chrome...");
             _browser = await Puppeteer.LaunchAsync(options);
             
-            var pages = await _browser.PagesAsync();
-            _page = pages.Length > 0 ? pages[0] : await _browser.NewPageAsync();
+            // Forzar minimizado mediante el proceso si es posible
+            try 
+            {
+                var pages = await _browser.PagesAsync();
+                _page = pages.Length > 0 ? pages[0] : await _browser.NewPageAsync();
+            }
+            catch (Exception ex)
+            {
+                _logger.LogWarning("Error inicializando página, reintentando... {Msg}", ex.Message);
+                await Task.Delay(1000);
+                var pages = await _browser.PagesAsync();
+                _page = pages.Length > 0 ? pages[0] : await _browser.NewPageAsync();
+            }
+
+            if (_page == null) throw new Exception("No se pudo crear la página del navegador.");
 
-            // User-Agent más actualizado y realista (Chrome 131)
             await _page.SetUserAgentAsync("Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36");
             
-            // Viewport aleatorio pero realista
-            var random = new Random();
             await _page.SetViewportAsync(new ViewPortOptions
             {
-                Width = 1366 + random.Next(-50, 150),  // 1316-1516
-                Height = 768 + random.Next(-50, 150),  // 718-918
+                Width = 1366 + Random.Shared.Next(-50, 150),
+                Height = 768 + Random.Shared.Next(-50, 150),
                 DeviceScaleFactor = 1
             });
 
-            // INYECCIÓN MASIVA DE ANTI-DETECCIÓN
+            // Anti-detección
             await _page.EvaluateExpressionOnNewDocumentAsync(@"
-                // 1. Ocultar navigator.webdriver
-                Object.defineProperty(navigator, 'webdriver', {
-                    get: () => undefined,
-                });
-
-                // 2. Sobrescribir chrome property (PuppeteerSharp deja rastros)
-                window.chrome = {
-                    runtime: {},
-                    loadTimes: function() {},
-                    csi: function() {},
-                    app: {}
-                };
-
-                // 3. Modificar permissions API para evitar detección
+                Object.defineProperty(navigator, 'webdriver', { get: () => undefined });
+                window.chrome = { runtime: {}, loadTimes: function() {}, csi: function() {}, app: {} };
                 const originalQuery = window.navigator.permissions.query;
                 window.navigator.permissions.query = (parameters) => (
                     parameters.name === 'notifications' ?
                         Promise.resolve({ state: Notification.permission }) :
                         originalQuery(parameters)
                 );
-
-                // 4. Sobrescribir plugins y mimeTypes (navegadores automatizados tienen 0)
                 Object.defineProperty(navigator, 'plugins', {
                     get: () => [
-                        {
-                            0: {type: 'application/x-google-chrome-pdf', suffixes: 'pdf'},
-                            description: 'Portable Document Format',
-                            filename: 'internal-pdf-viewer',
-                            length: 1,
-                            name: 'Chrome PDF Plugin'
-                        },
-                        {
-                            0: {type: 'application/pdf', suffixes: 'pdf'},
-                            description: 'Portable Document Format',
-                            filename: 'mhjfbmdgcfjbbpaeojofohoefgiehjai',
-                            length: 1,
-                            name: 'Chrome PDF Viewer'
-                        }
+                        {0: {type: 'application/x-google-chrome-pdf', suffixes: 'pdf'}, description: 'Portable Document Format', filename: 'internal-pdf-viewer', length: 1, name: 'Chrome PDF Plugin'},
+                        {0: {type: 'application/pdf', suffixes: 'pdf'}, description: 'Portable Document Format', filename: 'mhjfbmdgcfjbbpaeojofohoefgiehjai', length: 1, name: 'Chrome PDF Viewer'}
                     ],
                 });
-
-                Object.defineProperty(navigator, 'mimeTypes', {
-                    get: () => [
-                        {type: 'application/pdf', suffixes: 'pdf', description: 'Portable Document Format'},
-                        {type: 'application/x-google-chrome-pdf', suffixes: 'pdf', description: ''}
-                    ],
-                });
-
-                // 5. languages debe ser array (no solo string)
-                Object.defineProperty(navigator, 'languages', {
-                    get: () => ['es-ES', 'es', 'en-US', 'en'],
-                });
-
-                // 6. WebGL vendor info (importante para fingerprinting)
+                Object.defineProperty(navigator, 'languages', { get: () => ['es-ES', 'es', 'en-US', 'en'] });
                 const getParameter = WebGLRenderingContext.prototype.getParameter;
                 WebGLRenderingContext.prototype.getParameter = function(parameter) {
-                    if (parameter === 37445) {
-                        return 'Intel Inc.'; // UNMASKED_VENDOR_WEBGL
-                    }
-                    if (parameter === 37446) {
-                        return 'Intel(R) UHD Graphics'; // UNMASKED_RENDERER_WEBGL
-                    }
+                    if (parameter === 37445) return 'Intel Inc.';
+                    if (parameter === 37446) return 'Intel(R) UHD Graphics';
                     return getParameter.apply(this, [parameter]);
                 };
-
-                // 7. Ocultar características de headless Chrome
-                Object.defineProperty(navigator, 'hardwareConcurrency', {
-                    get: () => 4 + Math.floor(Math.random() * 5) // 4-8 cores (realista)
-                });
-
-                Object.defineProperty(navigator, 'deviceMemory', {
-                    get: () => 8 // 8GB RAM
-                });
-
-                // 8. Sobrescribir Notification.permission
-                Object.defineProperty(Notification, 'permission', {
-                    get: () => 'default'
-                });
-
-                // 9. Battery API (navegadores automatizados no tienen)
+                Object.defineProperty(navigator, 'hardwareConcurrency', { get: () => 4 + Math.floor(Math.random() * 5) });
+                Object.defineProperty(navigator, 'deviceMemory', { get: () => 8 });
                 Object.defineProperty(navigator, 'getBattery', {
-                    get: () => () => Promise.resolve({
-                        charging: true,
-                        chargingTime: 0,
-                        dischargingTime: Infinity,
-                        level: 0.97
-                    })
+                    get: () => () => Promise.resolve({ charging: true, chargingTime: 0, dischargingTime: Infinity, level: 0.97 })
                 });
-
-                // 10. Connection API
                 Object.defineProperty(navigator, 'connection', {
-                    get: () => ({
-                        effectiveType: '4g',
-                        downlink: 10,
-                        rtt: 50,
-                        saveData: false
-                    })
+                    get: () => ({ effectiveType: '4g', downlink: 10, rtt: 50, saveData: false })
                 });
-
-                // 11. Evitar detección por timing attacks
-                const originalDate = Date;
-                Date = class extends originalDate {
-                    constructor(...args) {
-                        if (args.length === 0) {
-                            super();
-                            // Añadir jitter aleatorio de 0-5ms
-                            const jitter = Math.floor(Math.random() * 5);
-                            return new originalDate(super.getTime() + jitter);
-                        }
-                        return new originalDate(...args);
-                    }
-                };
-
-                // 12. Ocultar '__playwright' y '__puppeteer' si existen
-                delete window.__playwright;
-                delete window.__puppeteer;
-
-                console.log('✅ Anti-detección ejecutada exitosamente');
+                console.log('✅ Anti-detección ejecutada');
             ");
 
             _logger.LogInformation("Navegando a WhatsApp Web...");
@@ -218,70 +136,75 @@ namespace WhatsappPromo.Engine.Services
             {
                 WaitUntil = new[] { WaitUntilNavigation.Networkidle0 }
             });
-
-            _logger.LogInformation("WhatsApp Web cargado.");
         }
 
         public async Task<Page> GetPageAsync()
         {
             if (_page == null) await InitializeAsync();
-            return (Page)_page; 
+            return (_page as Page) ?? throw new Exception("Error al obtener la página de Puppeteer");
         }
 
         public async Task CloseAsync()
         {
-            if (_browser != null) await _browser.CloseAsync();
+            try 
+            {
+                if (_browser != null && !_browser.IsClosed)
+                {
+                    _logger.LogInformation("Cerrando navegador...");
+                    await _browser.CloseAsync();
+                }
+            }
+            catch (Exception ex)
+            {
+                _logger.LogWarning("Error al cerrar el navegador: {Message}", ex.Message);
+            }
+            finally
+            {
+                _browser = null;
+                _page = null;
+            }
         }
 
         public async Task PerformHumanIdleActionsAsync()
         {
-            if (_page == null) return;
+            if (_page == null || _page.IsClosed) return;
 
             try
             {
-                var rnd = new Random();
-                var action = rnd.Next(1, 4);
-
+                var action = Random.Shared.Next(1, 4);
                 switch (action)
                 {
-                    case 1: // Random Mouse Move con curva Bezier (más humano)
-                        var x = rnd.Next(100, 1000);
-                        var y = rnd.Next(100, 600);
-                        // Steps más alto = movimiento más suave y humano
-                        await _page.Mouse.MoveAsync(x, y, new MoveOptions { Steps = rnd.Next(20, 60) });
+                    case 1:
+                        var x = Random.Shared.Next(100, 1000);
+                        var y = Random.Shared.Next(100, 600);
+                        await _page.Mouse.MoveAsync(x, y, new MoveOptions { Steps = Random.Shared.Next(20, 60) });
                         break;
-                    case 2: // Small Scroll con variación
-                        var delta = rnd.Next(-150, 150);
+                    case 2:
+                        var delta = Random.Shared.Next(-150, 150);
                         await _page.Mouse.WheelAsync(0, delta);
                         break;
-                    case 3: // Pause con duración variable (simula lectura)
-                        await Task.Delay(rnd.Next(1500, 4000));
+                    case 3:
+                        await Task.Delay(Random.Shared.Next(1500, 4000));
                         break;
                 }
             }
-            catch { /* Ignore errors during idle actions */ }
+            catch { }
         }
 
-        public async Task<string> GetQrCodeAsync()
+        public async Task<string?> GetQrCodeAsync()
         {
-            if (_page == null) return null;
+            if (_page == null || _page.IsClosed) return null;
             
             try 
             {
-                // Selector del canvas del QR
                 var qrSelector = "canvas"; 
-                await _page.WaitForSelectorAsync(qrSelector, new WaitForSelectorOptions { Timeout = 5000 });
                 var element = await _page.QuerySelectorAsync(qrSelector);
                 if (element != null)
                 {
-                    // Devolver como base64 para el frontend
                     return await element.ScreenshotBase64Async();
                 }
             }
-            catch
-            {
-                // No se encontró código QR (posiblemente ya logueado)
-            }
+            catch {}
             return null;
         }
     }

src/Backend/WhatsappPromo.Worker/Controllers/ConfigController.cs

@@ -1,7 +1,9 @@
 using Microsoft.AspNetCore.Mvc;
 using System;
 using System.IO;
+using System.Threading;
 using System.Threading.Tasks;
+using System.Windows.Forms;
 using WhatsappPromo.Core.Models;
 using WhatsappPromo.Core.Services;
 
@@ -28,7 +30,6 @@ namespace WhatsappPromo.Worker.Controllers
         [HttpPost]
         public async Task<IActionResult> UpdateConfig([FromBody] SystemConfig config)
         {
-             // Validar ruta
              if (!string.IsNullOrEmpty(config.DownloadPath))
              {
                  try 
@@ -62,5 +63,64 @@ namespace WhatsappPromo.Worker.Controllers
              await _configService.UpdateConfigAsync(config);
              return Ok(new { status = "Stopping" });
         }
+
+        [System.Runtime.InteropServices.DllImport("user32.dll")]
+        [return: System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.Bool)]
+        private static extern bool SetForegroundWindow(IntPtr hWnd);
+
+        [System.Runtime.InteropServices.DllImport("user32.dll")]
+        private static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, uint uFlags);
+
+        private static readonly IntPtr HWND_TOPMOST = new IntPtr(-1);
+        private const uint SWP_NOSIZE = 0x0001;
+        private const uint SWP_NOMOVE = 0x0002;
+        private const uint SWP_SHOWWINDOW = 0x0040;
+
+        [HttpGet("browse")]
+        public IActionResult Browse()
+        {
+            string? selectedPath = null;
+            
+            var thread = new Thread(() =>
+            {
+                using (var dummyForm = new Form())
+                {
+                    dummyForm.TopMost = true;
+                    // El form debe ser "real" para que Windows lo respete
+                    dummyForm.Width = 1; dummyForm.Height = 1;
+                    dummyForm.Opacity = 0.05;
+                    dummyForm.ShowInTaskbar = false;
+                    dummyForm.FormBorderStyle = FormBorderStyle.None;
+                    dummyForm.StartPosition = FormStartPosition.CenterScreen;
+                    
+                    dummyForm.Show();
+                    
+                    // Forzamos la posición al frente de todo
+                    SetWindowPos(dummyForm.Handle, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_SHOWWINDOW);
+                    SetForegroundWindow(dummyForm.Handle);
+                    dummyForm.Activate();
+                    dummyForm.Focus();
+
+                    using (var fbd = new FolderBrowserDialog())
+                    {
+                        fbd.Description = "Selecciona la carpeta para descargas de WhatsApp";
+                        fbd.UseDescriptionForTitle = true;
+                        fbd.ShowNewFolderButton = true;
+                        
+                        if (fbd.ShowDialog(dummyForm) == DialogResult.OK)
+                        {
+                            selectedPath = fbd.SelectedPath;
+                        }
+                    }
+                    dummyForm.Close();
+                }
+            });
+
+            thread.SetApartmentState(ApartmentState.STA);
+            thread.Start();
+            thread.Join();
+
+            return Ok(new { path = selectedPath });
+        }
     }
 }

src/Backend/WhatsappPromo.Worker/Program.cs

@@ -39,7 +39,10 @@ var app = builder.Build();
 
 app.UseCors("AllowDashboard");
 
-app.UseHttpsRedirection();
+if (!app.Environment.IsDevelopment())
+{
+    app.UseHttpsRedirection();
+}
 app.UseAuthorization();
 app.MapControllers();
 app.MapHub<WhatsappHub>("/whatsappHub"); // SignalR Endpoint for Frontend

src/Backend/WhatsappPromo.Worker/WhatsappPromo.Worker.csproj

@@ -1,9 +1,11 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <TargetFramework>net10.0</TargetFramework>
+    <TargetFramework>net10.0-windows</TargetFramework>
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
+    <OutputType>Exe</OutputType>
+    <UseWindowsForms>true</UseWindowsForms>
   </PropertyGroup>
 
   <ItemGroup>

src/Backend/WhatsappPromo.Worker/WhatsappWorker.cs

@@ -18,7 +18,7 @@ namespace WhatsappPromo.Worker
     {
         private readonly ILogger<WhatsappWorker> _logger;
         private readonly IBrowserService _browserService;
-        private readonly IConfigService _configService; // Check this dependency
+        private readonly IConfigService _configService;
         private readonly Channel<ProcessedMedia> _mediaChannel;
         private readonly IHubContext<WhatsappHub> _hubContext;
         private readonly SemaphoreSlim _lock = new(1, 1);
@@ -42,29 +42,44 @@ namespace WhatsappPromo.Worker
             
             while (!stoppingToken.IsCancellationRequested)
             {
-                var config = await _configService.GetConfigAsync();
-                
-                if (config.IsActive && !_isAutomationRunning)
+                try 
                 {
-                    _ = StartAutomationAsync(stoppingToken); 
-                }
+                    var config = await _configService.GetConfigAsync();
                     
-                await Task.Delay(2000, stoppingToken);
+                    if (config.IsActive && !_isAutomationRunning)
+                    {
+                        _ = StartAutomationAsync(stoppingToken); 
+                    }
+                    
+                    await Task.Delay(2000, stoppingToken);
+                }
+                catch (OperationCanceledException)
+                {
+                    break;
+                }
+                catch (Exception ex)
+                {
+                    _logger.LogError(ex, "Error en el bucle principal del Worker");
+                }
             }
+
+            _logger.LogInformation("Cerrando servicio worker...");
+            await _browserService.CloseAsync();
         }
 
-        private async Task StartAutomationAsync(CancellationToken token)
+        private async Task StartAutomationAsync(CancellationToken stoppingToken)
         {
             if (_isAutomationRunning) return;
 
             try 
             {
-                await _lock.WaitAsync(token);
+                await _lock.WaitAsync(stoppingToken);
                 if (_isAutomationRunning) return;
 
                 _isAutomationRunning = true;
                 _logger.LogInformation("Iniciando AUTOMATIZACIÓN...");
-                await _hubContext.Clients.All.SendAsync("StatusUpdate", "Iniciando...", token);
+                
+                await SafeSendAsync("StatusUpdate", "Iniciando...");
                 
                 await _browserService.InitializeAsync();
                 var page = await _browserService.GetPageAsync();
@@ -72,7 +87,7 @@ namespace WhatsappPromo.Worker
                 // Configurar bindings
                 await page.ExposeFunctionAsync("onNewMessage", (Func<string, Task>)(async (string jsonMessage) =>
                 {
-                   await _hubContext.Clients.All.SendAsync("LogUpdate", $"Mensaje recibido: {jsonMessage}");
+                   await SafeSendAsync("LogUpdate", $"Mensaje recibido: {jsonMessage}");
                 }));
 
                 await page.ExposeFunctionAsync("onMediaDownloaded", (Func<string, string, string, Task>)(async (string phone, string base64, string mimeType) =>
@@ -81,13 +96,13 @@ namespace WhatsappPromo.Worker
                     {
                         var msg = "No se pudo detectar el número de teléfono. Archivo ignorado. Asegúrese de tener el chat abierto.";
                         _logger.LogWarning(msg);
-                        await _hubContext.Clients.All.SendAsync("PersistentLog", "ERROR", msg);
+                        await SafeSendAsync("PersistentLog", "ERROR", msg);
                         return;
                     }
 
                     var size = base64.Length;
                     _logger.LogInformation("Media recibido de {Phone}. Tamaño: {Size} bytes", phone, size);
-                    await _hubContext.Clients.All.SendAsync("NewMediaReceived", new { Phone = phone, Base64 = base64, MimeType = mimeType });
+                    await SafeSendAsync("NewMediaReceived", new { Phone = phone, Base64 = base64, MimeType = mimeType });
 
                     await _mediaChannel.Writer.WriteAsync(new ProcessedMedia 
                     {
@@ -95,19 +110,19 @@ namespace WhatsappPromo.Worker
                         Base64Content = base64,
                         MimeType = mimeType,
                         Timestamp = DateTime.Now
-                    });
+                    }, stoppingToken);
                 }));
 
                 await page.EvaluateFunctionOnNewDocumentAsync(JsSnippets.MediaExtractor);
                 await page.ReloadAsync();
 
                 // Procesamiento en segundo plano
-                using var cts = CancellationTokenSource.CreateLinkedTokenSource(token);
+                using var cts = CancellationTokenSource.CreateLinkedTokenSource(stoppingToken);
                 var config = await _configService.GetConfigAsync();
-                _ = ProcessMediaQueueAsync(config.DownloadPath, cts.Token);
+                var processTask = ProcessMediaQueueAsync(config.DownloadPath, cts.Token);
 
                 // Bucle de monitoreo
-                while (!token.IsCancellationRequested)
+                while (!stoppingToken.IsCancellationRequested)
                 {
                     var currentConfig = await _configService.GetConfigAsync();
                     if (!currentConfig.IsActive)
@@ -116,7 +131,7 @@ namespace WhatsappPromo.Worker
                          break;
                     }
 
-                    if (new Random().Next(0, 10) > 6) 
+                    if (Random.Shared.Next(0, 10) > 6) 
                     {
                         await _browserService.PerformHumanIdleActionsAsync();
                     }
@@ -126,42 +141,63 @@ namespace WhatsappPromo.Worker
                         var qrBase64 = await _browserService.GetQrCodeAsync();
                         if (!string.IsNullOrEmpty(qrBase64))
                         {
-                            await _hubContext.Clients.All.SendAsync("QrCodeUpdate", qrBase64, token);
-                            await _hubContext.Clients.All.SendAsync("StatusUpdate", "Esperando Login (QR)", token);
+                            await SafeSendAsync("QrCodeUpdate", qrBase64);
+                            await SafeSendAsync("StatusUpdate", "Esperando Login (QR)");
                         }
                         else
                         {
-                             await _hubContext.Clients.All.SendAsync("QrCodeUpdate", null, token);
-                             await _hubContext.Clients.All.SendAsync("StatusUpdate", "Conectado y Escaneando", token);
+                             await SafeSendAsync("QrCodeUpdate", null);
+                             await SafeSendAsync("StatusUpdate", "Conectado y Escaneando");
                         }
                     } 
                     catch {}
                     
                     if (page.IsClosed) break;
 
-                    await Task.Delay(2000, token);
+                    await Task.Delay(2000, stoppingToken);
                 }
                 
                 cts.Cancel();
+                await processTask;
             }
+            catch (OperationCanceledException) {}
             catch (Exception ex)
             {
                 _logger.LogError(ex, "Error en automatización");
-                await _hubContext.Clients.All.SendAsync("LogUpdate", $"ERROR: {ex.Message}");
+                await SafeSendAsync("LogUpdate", $"ERROR: {ex.Message}");
                 
-                var conf = await _configService.GetConfigAsync();
-                conf.IsActive = false;
-                await _configService.UpdateConfigAsync(conf);
+                try 
+                {
+                    var conf = await _configService.GetConfigAsync();
+                    conf.IsActive = false;
+                    await _configService.UpdateConfigAsync(conf);
+                } catch {}
             }
             finally
             {
                 await _browserService.CloseAsync();
                 _isAutomationRunning = false;
-                await _hubContext.Clients.All.SendAsync("StatusUpdate", "Detenido");
+                await SafeSendAsync("QrCodeUpdate", null);
+                await SafeSendAsync("StatusUpdate", "Detenido");
                 _lock.Release();
             }
         }
 
+        private async Task SafeSendAsync(string method, object? arg1, object? arg2 = null)
+        {
+            try 
+            {
+                if (arg2 != null)
+                    await _hubContext.Clients.All.SendAsync(method, arg1, arg2);
+                else
+                    await _hubContext.Clients.All.SendAsync(method, arg1);
+            }
+            catch (Exception ex)
+            {
+                _logger.LogDebug("SignalR Send skipped: {Msg}", ex.Message);
+            }
+        }
+
         private int _processedToday = 0;
         private int _processedThisHour = 0;
         private int _currentDay = -1;
@@ -173,7 +209,8 @@ namespace WhatsappPromo.Worker
             if (string.IsNullOrEmpty(storagePath)) 
                 storagePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "ReceivedMedia");
 
-            Directory.CreateDirectory(storagePath);
+            if (!Directory.Exists(storagePath))
+                Directory.CreateDirectory(storagePath);
 
             try 
             {
@@ -183,68 +220,35 @@ namespace WhatsappPromo.Worker
                     {
                         var config = await _configService.GetConfigAsync();
                         
-                        // 1. Verificar y resetear contadores de tiempo
                         var now = DateTime.Now;
-                        if (_currentDay != now.Day)
-                        {
-                            _currentDay = now.Day;
-                            _processedToday = 0;
-                        }
-                        if (_currentHour != now.Hour)
-                        {
-                            _currentHour = now.Hour;
-                            _processedThisHour = 0;
-                        }
+                        if (_currentDay != now.Day) { _currentDay = now.Day; _processedToday = 0; }
+                        if (_currentHour != now.Hour) { _currentHour = now.Hour; _processedThisHour = 0; }
 
-                        // 2. Verificar CUOTAS
                         while (_processedToday >= config.MaxFilesPerDay || _processedThisHour >= config.MaxFilesPerHour)
                         {
-                            var waitMsg = $"Cuota alcanzada ({_processedThisHour}/{config.MaxFilesPerHour}h, {_processedToday}/{config.MaxFilesPerDay}d). Pausando procesamiento...";
-                            _logger.LogWarning(waitMsg);
-                            await _hubContext.Clients.All.SendAsync("LogUpdate", $"[CUOTA] {waitMsg}", token);
-                            
-                            // Esperar 1 minuto antes de volver a chequear
+                            await SafeSendAsync("LogUpdate", $"[CUOTA] Límite alcanzado, esperando...");
                             await Task.Delay(60000, token);
-                            
                             now = DateTime.Now;
                             if (_currentDay != now.Day) { _currentDay = now.Day; _processedToday = 0; }
                             if (_currentHour != now.Hour) { _currentHour = now.Hour; _processedThisHour = 0; }
                         }
 
-                        // 3. Humanizar tiempo de procesamiento (Delay aleatorio)
-                        // Si estamos cerca del límite, aumentamos el delay para "suavizar" el pico
-                        int baseDelay = Random.Shared.Next(5000, 15000); // 5-15s base
-                        if (_processedThisHour > config.MaxFilesPerHour * 0.8) 
-                        {
-                            baseDelay = Random.Shared.Next(30000, 60000); // Ralentizar al final de la hora
-                        }
-                        
-                        await Task.Delay(baseDelay, token);
-
-                        var extension = media.MimeType switch 
-                        {
-                            "image/jpeg" => ".jpg",
-                            "image/png" => ".png",
-                            "video/mp4" => ".mp4",
-                            _ => ".dat"
-                        };
+                        int delay = Random.Shared.Next(5000, 15000);
+                        if (_processedThisHour > config.MaxFilesPerHour * 0.8) delay = Random.Shared.Next(30000, 60000);
+                        await Task.Delay(delay, token);
 
+                        var extension = media.MimeType switch { "image/jpeg" => ".jpg", "image/png" => ".png", "video/mp4" => ".mp4", _ => ".dat" };
                         var fileName = $"{media.PhoneNumber}_{media.Timestamp:yyyyMMdd_HHmmss_fff}{extension}";
                         var fullPath = Path.Combine(storagePath, fileName);
                         
-                        var bytes = Convert.FromBase64String(media.Base64Content);
-                        await File.WriteAllBytesAsync(fullPath, bytes, token);
+                        await File.WriteAllBytesAsync(fullPath, Convert.FromBase64String(media.Base64Content), token);
                         
                         _processedToday++;
                         _processedThisHour++;
-
-                        _logger.LogInformation("Archivo guardado: {Path}. Cuota: {H}/{D}", fullPath, _processedThisHour, _processedToday);
-                        await _hubContext.Clients.All.SendAsync("LogUpdate", $"Archivo guardado: {fileName} (Cuota: {_processedThisHour}/{config.MaxFilesPerHour}h)", token);
-                    }
-                    catch (Exception ex)
-                    {
-                        _logger.LogError(ex, "Error procesando media");
+                        await SafeSendAsync("LogUpdate", $"Archivo guardado: {fileName}");
                     }
+                    catch (OperationCanceledException) { break; }
+                    catch (Exception ex) { _logger.LogError(ex, "Error en cola"); }
                 }
             }
             catch (OperationCanceledException) {}

src/Frontend/WhatsappPromo.Dashboard/index.html

@@ -1,13 +1,16 @@
 <!doctype html>
 <html lang="en">
-  <head>
-    <meta charset="UTF-8" />
-    <link rel="icon" type="image/svg+xml" href="/vite.svg" />
-    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>whatsapppromo-dashboard</title>
-  </head>
-  <body>
-    <div id="root"></div>
-    <script type="module" src="/src/main.tsx"></script>
-  </body>
+
+<head>
+  <meta charset="UTF-8" />
+  <link rel="icon" type="image/svg+xml" href="/vite.svg" />
+  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+  <title>whatsapppromo-dashboard</title>
+</head>
+
+<body style="background-color: #0f172a; margin: 0;">
+  <div id="root"></div>
+  <script type="module" src="/src/main.tsx"></script>
+</body>
+
 </html>

src/Frontend/WhatsappPromo.Dashboard/package.json

@@ -11,6 +11,7 @@
   },
   "dependencies": {
     "@microsoft/signalr": "^10.0.0",
+    "@tailwindcss/vite": "^4.1.18",
     "react": "^19.2.0",
     "react-dom": "^19.2.0"
   },

src/Frontend/WhatsappPromo.Dashboard/src/App.tsx

@@ -28,6 +28,7 @@ function App() {
     maxFilesPerDay: 50
   });
   const [loading, setLoading] = useState(false);
+  const [isBrowsing, setIsBrowsing] = useState(false);
   const [alert, setAlert] = useState<{ type: 'error' | 'info', message: string } | null>(null);
 
   useEffect(() => {
@@ -83,6 +84,7 @@ function App() {
   const toggleAutomation = async () => {
     setLoading(true);
     const endpoint = config.isActive ? 'stop' : 'start';
+    if (config.isActive) setQrCode(null); // Limpieza inmediata local
     try {
       await fetch(`http://localhost:5067/api/config/${endpoint}`, { method: 'POST' });
       setConfig((prev: SystemConfig) => ({ ...prev, isActive: !prev.isActive }));
@@ -108,8 +110,34 @@ function App() {
     }
   };
 
+  const handleBrowse = async () => {
+    try {
+      setIsBrowsing(true);
+      const res = await fetch('http://localhost:5067/api/config/browse');
+      const data = await res.json();
+      if (data.path) {
+        setConfig(prev => ({ ...prev, downloadPath: data.path }));
+      }
+    } catch (err) {
+      console.error("Error browsing directory", err);
+    } finally {
+      setIsBrowsing(false);
+    }
+  };
+
   return (
-    <div className="min-h-screen bg-gray-900 text-white p-8 font-sans">
+    <div className="min-h-screen bg-slate-900 text-white p-8 font-sans relative">
+
+      {/* BLOQUEO DE INTERACCIÓN DURANTE SELECCIÓN DE CARPETA */}
+      {isBrowsing && (
+        <div className="fixed inset-0 bg-black/60 z-[100] flex flex-col items-center justify-center backdrop-blur-sm cursor-wait">
+          <div className="bg-gray-800 p-8 rounded-2xl shadow-2xl border border-gray-700 flex flex-col items-center gap-4">
+            <div className="w-12 h-12 border-4 border-green-500 border-t-transparent rounded-full animate-spin"></div>
+            <p className="text-xl font-bold">Seleccionando Carpeta...</p>
+            <p className="text-gray-400 text-sm">Por favor, usa la ventana de Windows que acaba de aparecer.</p>
+          </div>
+        </div>
+      )}
 
       {alert && (
         <div className={`fixed top-4 left-1/2 transform -translate-x-1/2 z-50 px-6 py-4 rounded shadow-2xl flex items-center gap-4 ${alert.type === 'error' ? 'bg-red-800 text-white border border-red-500' : 'bg-blue-800 text-white border border-blue-500'
@@ -123,56 +151,68 @@ function App() {
         </div>
       )}
 
-      <div className="flex flex-col lg:flex-row justify-between lg:items-center mb-8 gap-4">
-        <h1 className="text-4xl font-bold text-green-400">WhatsApp Promo Monitor</h1>
+      <div className="flex flex-col lg:flex-row justify-between lg:items-center mb-10 gap-6">
+        <h1 className="text-4xl font-black text-green-500 tracking-tight drop-shadow-md">
+          WhatsApp Promo Monitor
+        </h1>
 
-        <div className="flex flex-wrap gap-6 items-center bg-gray-800 p-4 rounded-lg shadow-xl border border-gray-700">
-          <div className="flex flex-col">
-            <label className="text-xs text-gray-400 mb-1 uppercase tracking-wider font-bold">Ruta de Descarga</label>
-            <input
-              type="text"
-              value={config.downloadPath}
-              onChange={(e: React.ChangeEvent<HTMLInputElement>) => setConfig({ ...config, downloadPath: e.target.value })}
-              className="bg-gray-700 text-sm px-2 py-1.5 rounded w-48 border border-gray-600 focus:border-green-500 outline-none transition-colors"
-              placeholder="C:\Downloads..."
-            />
+        <div className="flex flex-col md:flex-row items-stretch md:items-end gap-4 bg-gray-800 p-5 rounded-2xl shadow-2xl border border-gray-700">
+          <div className="flex flex-col flex-1 min-w-[200px]">
+            <label className="text-[10px] text-gray-400 mb-1.5 uppercase tracking-widest font-extrabold">Ruta de Descarga</label>
+            <div className="flex gap-2">
+              <input
+                type="text"
+                value={config.downloadPath}
+                onChange={(e: React.ChangeEvent<HTMLInputElement>) => setConfig({ ...config, downloadPath: e.target.value })}
+                className="flex-1 bg-gray-900 text-sm px-3 py-2.5 rounded-lg border border-gray-600 focus:border-green-500 outline-none transition-all"
+                placeholder="Seleccionar carpeta..."
+              />
+              <button
+                onClick={handleBrowse}
+                className="bg-gray-700 hover:bg-gray-600 px-3 rounded-lg border border-gray-600 transition-all flex items-center justify-center"
+                title="Seleccionar Carpeta"
+              >
+                <span className="text-lg">📂</span>
+              </button>
+            </div>
           </div>
 
-          <div className="flex flex-col">
-            <label className="text-xs text-gray-400 mb-1 uppercase tracking-wider font-bold">Máx/Hora</label>
-            <input
-              type="number"
-              value={config.maxFilesPerHour}
-              onChange={(e: React.ChangeEvent<HTMLInputElement>) => setConfig({ ...config, maxFilesPerHour: parseInt(e.target.value) || 0 })}
-              className="bg-gray-700 text-sm px-2 py-1.5 rounded w-20 border border-gray-600 focus:border-green-500 outline-none transition-colors"
-            />
+          <div className="flex gap-3">
+            <div className="flex flex-col">
+              <label className="text-[10px] text-gray-400 mb-1.5 uppercase tracking-widest font-extrabold">Máx/Hora</label>
+              <input
+                type="number"
+                value={config.maxFilesPerHour}
+                onChange={(e: React.ChangeEvent<HTMLInputElement>) => setConfig({ ...config, maxFilesPerHour: parseInt(e.target.value) || 0 })}
+                className="bg-gray-900 text-sm px-2 py-2.5 rounded-lg border border-gray-600 focus:border-green-500 outline-none transition-all w-16 text-center font-bold"
+              />
+            </div>
+            <div className="flex flex-col">
+              <label className="text-[10px] text-gray-400 mb-1.5 uppercase tracking-widest font-extrabold">Máx/Día</label>
+              <input
+                type="number"
+                value={config.maxFilesPerDay}
+                onChange={(e: React.ChangeEvent<HTMLInputElement>) => setConfig({ ...config, maxFilesPerDay: parseInt(e.target.value) || 0 })}
+                className="bg-gray-900 text-sm px-2 py-2.5 rounded-lg border border-gray-600 focus:border-green-500 outline-none transition-all w-16 text-center font-bold"
+              />
+            </div>
           </div>
 
-          <div className="flex flex-col">
-            <label className="text-xs text-gray-400 mb-1 uppercase tracking-wider font-bold">Máx/Día</label>
-            <input
-              type="number"
-              value={config.maxFilesPerDay}
-              onChange={(e: React.ChangeEvent<HTMLInputElement>) => setConfig({ ...config, maxFilesPerDay: parseInt(e.target.value) || 0 })}
-              className="bg-gray-700 text-sm px-2 py-1.5 rounded w-20 border border-gray-600 focus:border-green-500 outline-none transition-colors"
-            />
-          </div>
-
-          <div className="flex gap-2 self-end">
+          <div className="flex gap-2 items-end">
             <button
               onClick={updateConfig}
-              className="bg-gray-700 hover:bg-gray-600 p-2 rounded border border-gray-600 transition-colors"
+              className="bg-slate-700 hover:bg-slate-600 p-3 rounded-lg border border-slate-600 transition-all shadow-md"
               title="Guardar Configuración"
             >
-              💾
+              <span className="text-lg leading-none">💾</span>
             </button>
 
             <button
               onClick={toggleAutomation}
               disabled={loading}
-              className={`px-6 py-2 rounded font-bold transition-all shadow-lg ${config.isActive
-                ? 'bg-red-600 hover:bg-red-700 shadow-red-900/40 border border-red-500'
-                : 'bg-green-600 hover:bg-green-700 shadow-green-900/40 border border-green-500'
+              className={`min-w-[140px] py-2.5 px-4 rounded-lg font-black transition-all shadow-lg text-sm border-b-4 active:border-b-0 active:translate-y-1 ${config.isActive
+                ? 'bg-red-600 hover:bg-red-500 border-red-800 text-white'
+                : 'bg-green-600 hover:bg-green-500 border-green-800 text-white shadow-green-900/20'
                 }`}
             >
               {loading ? '...' : (config.isActive ? '🛑 DETENER' : '▶ INICIAR')}
@@ -216,8 +256,8 @@ function App() {
             {logs.length === 0 && <p className="text-gray-600 italic">Esperando eventos...</p>}
             {logs.map((log: string, index: number) => (
               <li key={index} className={`list-none border-l-2 pl-3 py-1 ${log.includes('[CUOTA]') ? 'border-yellow-500 bg-yellow-900/10 text-yellow-200' :
-                  log.includes('ERROR') ? 'border-red-500 bg-red-900/10 text-red-300' :
-                    'border-green-500 bg-green-900/5 text-green-300'
+                log.includes('ERROR') ? 'border-red-500 bg-red-900/10 text-red-300' :
+                  'border-green-500 bg-green-900/5 text-green-300'
                 }`}>
                 {log}
               </li>

src/Frontend/WhatsappPromo.Dashboard/src/index.css

@@ -1,8 +1,38 @@
-@tailwind base;
-@tailwind components;
-@tailwind utilities;
+@import "tailwindcss";
 
-/* Custom scrollbar if needed */
-.scrollbar-hide::-webkit-scrollbar {
-    display: none;
+:root {
+    color-scheme: dark;
+}
+
+html,
+body {
+    margin: 0;
+    padding: 0;
+    background-color: #0f172a !important;
+    /* bg-slate-900 */
+    color: #f1f5f9;
+    height: 100%;
+}
+
+#root {
+    min-height: 100vh;
+    background-color: #0f172a !important;
+}
+
+/* Custom scrollbar */
+::-webkit-scrollbar {
+    width: 8px;
+}
+
+::-webkit-scrollbar-track {
+    background: #1e293b;
+}
+
+::-webkit-scrollbar-thumb {
+    background: #334155;
+    border-radius: 4px;
+}
+
+::-webkit-scrollbar-thumb:hover {
+    background: #475569;
 }

src/Frontend/WhatsappPromo.Dashboard/vite.config.ts

@@ -1,7 +1,11 @@
 import { defineConfig } from 'vite'
 import react from '@vitejs/plugin-react'
+import tailwindcss from '@tailwindcss/vite'
 
 // https://vite.dev/config/
 export default defineConfig({
-  plugins: [react()],
+  plugins: [
+    react(),
+    tailwindcss(),
+  ],
 })