Authentication Improvements

Improvements

• Remove unused auto-approve safe commands setting
• Add GitHub CLI status check to settings
• Show toast when app is already on the latest version
• Enable sound effects by default
• Linear integration auth improvements and build configuration
• Deduplicate getApiBase and fix conversation state leak
• Polish docs site nav with branded logo and redirect homepage
• Unified MCP servers panel with source tracking

Fixes

• Align code review dropdown menu items consistently
• Handle network errors in Linear auth and consistent error logging
• Wire up system menu actions and use native URL opener