v1.0.5

Release version 1.0.5: Collapsible TOC sidebar with overlay pattern

Features:
- Collapsible table of contents sidebar with hamburger toggle
- Sidebar slides in from right with smooth GPU-accelerated animation
- Theme-aware button styling for light and dark modes

Improvements:
- Fixed code block comment extraction to ignore code block content
- Fixed active state conflict in outline navigation with debouncing
- Simplified TOC styling with left-border active indicator

Release notes: See CHANGELOG.md for detailed changes.