docs: issues técnicas para nuevas funcionalidades

Agrega 19 issues técnicas documentando funcionalidades implementadas y pendientes.

Issues completadas (movidas a dev/issues/completed/):
- 001-conversor-web-markdown.md
- 002-accessibility-tree.md
- 003-gestion-cookies-perfil.md
- 004-gestion-extensiones-chrome.md
- 005-eliminar-timeouts-innecesarios.md

Issues implementadas:
- 006-manejo-tabs-ventanas.md
- 016-manejo-iframes.md
- 017-actions-api.md
- 018-file-uploads.md
- 019-expected-conditions-mejoradas.md

Issues pendientes (media prioridad):
- 007-alert-prompt-confirm-handling.md
- 008-screenshot-elementos-especificos.md
- 009-pdf-generation.md
- 010-device-emulation-completo.md
- 011-downloads-handling.md

Issues pendientes (baja prioridad / avanzado):
- 012-browser-contexts-multi-sesion.md
- 013-video-recording.md
- 014-network-mocking-avanzado.md
- 015-geolocation-permissions.md

Incluye también dev/NUEVAS_FUNCIONALIDADES.md con resumen completo.

Directorio: dev/

dev/issues/010-device-emulation-completo.md

@@ -0,0 +1,101 @@
+# Issue #010: Device Emulation Completo
+
+**Tipo**: Enhancement
+**Prioridad**: Media
+**Estado**: Pendiente
+
+## Descripción
+
+Implementar emulación completa de dispositivos móviles y tablets (viewport, user-agent, touch, geolocation).
+
+## Funcionalidad deseada
+
+- Emular dispositivos predefinidos (iPhone, iPad, Android, etc.)
+- Viewport personalizado (width, height, deviceScaleFactor)
+- User-Agent específico de dispositivo
+- Touch events habilitados
+- Orientación (portrait/landscape)
+- Geolocation personalizada
+- Timezone específica
+- Locale/idioma
+- Permisos de dispositivo
+
+## API propuesta
+
+```go
+type DeviceDescriptor struct {
+    Name              string
+    UserAgent         string
+    Viewport          Viewport
+    DeviceScaleFactor float64
+    IsMobile          bool
+    HasTouch          bool
+    DefaultOrientation string
+}
+
+type Viewport struct {
+    Width  int
+    Height int
+}
+
+type EmulationOptions struct {
+    Device      *DeviceDescriptor
+    Viewport    *Viewport
+    UserAgent   string
+    IsMobile    bool
+    HasTouch    bool
+    Orientation string // "portrait" | "landscape"
+    Geolocation *Geolocation
+    Timezone    string
+    Locale      string
+}
+
+// Dispositivos predefinidos
+var Devices = map[string]*DeviceDescriptor{
+    "iPhone 13":      {...},
+    "iPhone 13 Pro":  {...},
+    "iPad Pro":       {...},
+    "Pixel 5":        {...},
+    "Galaxy S21":     {...},
+}
+
+func (b *Browser) Emulate(ctx context.Context, opts *EmulationOptions) error
+func (b *Browser) EmulateDevice(ctx context.Context, deviceName string) error
+func (b *Browser) SetViewport(ctx context.Context, width, height int) error
+func (b *Browser) SetUserAgent(ctx context.Context, userAgent string) error
+func (b *Browser) SetTouchEnabled(ctx context.Context, enabled bool) error
+func (b *Browser) SetOrientation(ctx context.Context, orientation string) error
+```
+
+## Uso
+
+```go
+// Emular iPhone 13
+b.EmulateDevice(ctx, "iPhone 13")
+
+// Emulación personalizada
+opts := &browser.EmulationOptions{
+    Viewport: &browser.Viewport{Width: 375, Height: 812},
+    UserAgent: "Mozilla/5.0 (iPhone...)",
+    IsMobile: true,
+    HasTouch: true,
+    Orientation: "portrait",
+}
+b.Emulate(ctx, opts)
+```
+
+## CDP Methods
+
+- `Emulation.setDeviceMetricsOverride`
+- `Emulation.setUserAgentOverride`
+- `Emulation.setTouchEmulationEnabled`
+- `Emulation.setEmulatedMedia`
+- `Emulation.setGeolocationOverride`
+- `Emulation.setTimezoneOverride`
+- `Emulation.setLocaleOverride`
+
+## Referencias
+
+- CDP Emulation: https://chromedevtools.github.io/devtools-protocol/tot/Emulation/
+- Playwright devices: https://playwright.dev/docs/emulation
+- Puppeteer emulation: https://pptr.dev/guides/emulation