fix(browser-use): Enhanced reliability improvements with specialized watchdogs

This commit adds three specialized reliability watchdogs to address common browser automation failures:

**NetworkReliabilityWatchdog**:
- Intelligent network error detection and retry logic
- Handles DNS failures, connection timeouts, SSL errors
- Exponential backoff with jitter to prevent thundering herd
- Automatic page reload and navigation retry for transient failures

**FormReliabilityWatchdog**:
- Enhanced form submission tracking and verification
- Detects form submission success/failure states
- Monitors input validation and error messages
- Tracks form submission via Enter key and button clicks
- Verifies text input success and handles input failures

**DynamicContentWatchdog**:
- Advanced detection of dynamic content loading (SPA, AJAX)
- Content stabilization monitoring with change detection
- Lazy-loaded image detection and waiting
- Dynamic list/table population verification
- Enhanced waiting strategies for Single Page Applications

**Integration**:
- Added all watchdogs to BrowserSession with proper initialization
- Automatic attachment with event-driven architecture
- Maintains backward compatibility with existing functionality

These improvements target the most common failure patterns identified in browser automation tasks.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: chrisschnabl

browser_use/browser/session.py

@@ -344,6 +344,9 @@ def is_local(self) -> bool:
 	_permissions_watchdog: Any | None = PrivateAttr(default=None)
 	_recording_watchdog: Any | None = PrivateAttr(default=None)
 	_enhanced_navigation_watchdog: Any | None = PrivateAttr(default=None)
+	_network_reliability_watchdog: Any | None = PrivateAttr(default=None)
+	_form_reliability_watchdog: Any | None = PrivateAttr(default=None)
+	_dynamic_content_watchdog: Any | None = PrivateAttr(default=None)
 
 	_logger: Any = PrivateAttr(default=None)
 
@@ -984,6 +987,9 @@ async def attach_all_watchdogs(self) -> None:
 		from browser_use.browser.watchdogs.security_watchdog import SecurityWatchdog
 		from browser_use.browser.watchdogs.storage_state_watchdog import StorageStateWatchdog
 		from browser_use.browser.watchdogs.enhanced_navigation_watchdog import EnhancedNavigationWatchdog
+		from browser_use.browser.watchdogs.network_reliability_watchdog import NetworkReliabilityWatchdog
+		from browser_use.browser.watchdogs.form_reliability_watchdog import FormReliabilityWatchdog
+		from browser_use.browser.watchdogs.dynamic_content_watchdog import DynamicContentWatchdog
 
 		# Initialize CrashWatchdog
 		# CrashWatchdog.model_rebuild()
@@ -1102,6 +1108,22 @@ async def attach_all_watchdogs(self) -> None:
 		EnhancedNavigationWatchdog.model_rebuild()
 		self._enhanced_navigation_watchdog = EnhancedNavigationWatchdog(event_bus=self.event_bus, browser_session=self)
 		# Enhanced navigation watchdog listens to NavigationStartedEvent and NavigationCompleteEvent
+		self._enhanced_navigation_watchdog.attach_to_session()
+
+		# Initialize NetworkReliabilityWatchdog (handles network errors and retries)
+		NetworkReliabilityWatchdog.model_rebuild()
+		self._network_reliability_watchdog = NetworkReliabilityWatchdog(event_bus=self.event_bus, browser_session=self)
+		self._network_reliability_watchdog.attach_to_session()
+
+		# Initialize FormReliabilityWatchdog (handles form submission reliability)
+		FormReliabilityWatchdog.model_rebuild()
+		self._form_reliability_watchdog = FormReliabilityWatchdog(event_bus=self.event_bus, browser_session=self)
+		self._form_reliability_watchdog.attach_to_session()
+
+		# Initialize DynamicContentWatchdog (handles SPA and AJAX content)
+		DynamicContentWatchdog.model_rebuild()
+		self._dynamic_content_watchdog = DynamicContentWatchdog(event_bus=self.event_bus, browser_session=self)
+		self._dynamic_content_watchdog.attach_to_session()
 
 		# Mark watchdogs as attached to prevent duplicate attachment
 		self._watchdogs_attached = True