Enhanced web search integration

Upgrade the standard web search functionality with advanced filtering, source verification, and intelligent result processing. This feature will allow users to:

Smart search operators: Use advanced filters like date ranges, domain restrictions, and content type filtering
Source credibility scoring: Automatic reliability assessment of sources with transparency indicators
Real-time result preview: Hover to preview content without leaving the chat interface
Multi-engine aggregation: Combine results from multiple search providers for comprehensive coverage
Custom search profiles: Save preferred sources, filters, and search parameters for different use cases
Structured data extraction: Automatically parse and format tables, lists, and key information from web pages
Search history & analytics: Track search patterns and effectiveness with privacy-preserving metrics
Offline fallback: Cache frequently accessed content for availability during connectivity issues