Remove unnecessary unique IDs from help modal topic elements and their corresponding CSS selectors, replacing them with more maintainable nth-child pseudo-selectors.
- Add HelpModal enum entries for titles and content
- Implement HelpModalSvelte component with sidebar navigation
- Add topic selection functionality with fade transitions
- Style help modal with grid layout and custom backgrounds
- Display plugin version in modal footer
- Apply consistent spacing with conversation history modal
- Add HelpModal integration to TopBar with circle-help icon
- Update LICENSE from 0BSD to MIT License
- Refactor modal constructors to use dependency injection
- Format code style (quotes, indentation) in TopBar and ConversationHistoryModal
