feat: comprehensive console capture and offline mode support

Major enhancements to browser automation and debugging capabilities:

**Console Capture Features:**
- Add console output file option (CLI, env var, session config)
- Enhanced CDP console capture for service worker messages
- Browser-level security warnings and mixed content errors
- Network failure and loading error capture
- All console contexts written to structured log files
- Chrome extension for comprehensive console message interception

**Offline Mode Support:**
- Add browser_set_offline tool for DevTools-equivalent offline mode
- Integrate offline mode into browser_configure tool
- Support for testing network failure scenarios and service worker behavior

**Extension Management:**
- Improved extension installation messaging about session persistence
- Console capture extension with debugger API access
- Clear communication about extension lifecycle to MCP clients

**Technical Implementation:**
- CDP session management across multiple domains (Runtime, Network, Security, Log)
- Service worker context console message interception
- Browser context factory integration for offline mode
- Pure Chromium configuration for optimal extension support

All features provide MCP clients with powerful debugging capabilities
equivalent to Chrome DevTools console and offline functionality.

src/context.ts

@@ -315,6 +315,11 @@ export class Context {
 
     const browserContext = await browser.newContext(contextOptions);
 
+    // Apply offline mode if configured
+    if ((this.config as any).offline !== undefined) {
+      await browserContext.setOffline((this.config as any).offline);
+    }
+
     return {
       browserContext,
       close: async () => {
@@ -373,6 +378,7 @@ export class Context {
     timezone?: string;
     colorScheme?: 'light' | 'dark' | 'no-preference';
     permissions?: string[];
+    offline?: boolean;
   }): Promise<void> {
     const currentConfig = { ...this.config };
 
@@ -428,6 +434,10 @@ export class Context {
       currentConfig.browser.contextOptions.permissions = changes.permissions;
 
 
+    if (changes.offline !== undefined)
+      (currentConfig.browser as any).offline = changes.offline;
+
+
     // Store the modified config
     (this as any).config = currentConfig;