Added

Comprehensive Search Functionality
- Supports multi-source searching (open tabs, recently closed tabs, history, bookmarks, reading list)
- Supports multiple search engines (Google, Bing, Yahoo, Baidu, Yandex, DuckDuckGo, Ask)
- Supports @ commands for quick search source switching
- Supports custom management and sorting of search sources
AI Chat Integration in Search Bar
- After entering content in the search bar, can open target website and automatically fill chat dialog and submit query
- Default support for mainstream AI conversation models including ChatGPT, Claude, Gemini, DeepSeek
- Supports adding, editing, deleting, and sorting model selections
Automatic Tab Grouping
- Introduces flexible domain name format options: main domain, subdomain, domain prefix, domain without suffix, and custom combinations

Changed

Tab Tree Processing Optimization
- Adds circular reference detection and automatic repair mechanism
- Optimizes parent-child tab relationship processing
Recently Closed Tabs Improvements
- Changes default recently closed tabs retention time (from 1 day to 30 days)
- Increases recently closed tabs count limit (from 100 to 5000)
- Optimizes history synchronization mechanism
- Restores tab history records when restoring from recently closed tabs
TabLens Functionality Optimization
- Optimizes monitored elements performance
- Allows free users to save configurations (with limit of 1 per site)

Fixes issue where current tab's close button doesn't display on hover (Issue #33)
Fixes issue where icons can't display normally due to faviconkit rate limiting (Issue #34)
Fixes duplicate UUID issue in quick access list
Improves empty title tab handling logic
Resolves circular reference issue in tab tree
Fixes tab metadata cache synchronization issue

Removes auto-create/join same domain name group feature (replaced by automatic tab grouping)