Changes

• Initial browser implementation with Playwright for web scraping and page interaction
• Improve context compaction for better token efficiency
• Show more granular browser events in the UI
• Add Claude Opus 4.6 model support
• Add model display name to model selector
• Add progress channel to show intermediate agent steps
• Show ThinkingView for model reasoning visibility
• Update intro component
• Add release script for CalVer-based GitHub releases

Fixes

• Fix empty tool call issue