add missing changelog and update package lock file

CHANGELOG.md

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+## [1.0.0] - 2026-01-12
+
+### Added
+- Guided Learning Paths feature for structured learning progression
+- Conceptual explanations and diagrams throughout HTML, CSS, and Tailwind lessons
+- "Why This Works" concept section with collapsible details/summary elements
+- Reset code confirmation dialog with skip option
+- CodeMirror 6 editor with Emmet support and syntax highlighting
+- Undo/redo/reset editor tools with keyboard shortcuts
+- Module progress indicator and cross-module navigation
+- Slide-out sidebar layout with lesson modules
+- Language switcher supporting English, German, Polish, Spanish, Arabic, and Ukrainian
+- Dynamic lesson loading by language with RTL support for Arabic
+- Playground module with full-height HTML & CSS editor
+- Welcome lesson with Hello World examples in 8 languages and DVD bounce animation
+- Gentle loading fallback after 3 seconds
+- Live code preview with instant feedback
+- Complete German translation of the website
+- Toggle switch for disabling error feedback with persistent user settings
+- Code caching for instant lesson restoration on page reload
+- Help dialog with learning modes and editor tools information
+- More Projects section in help resources
+- Footer with links to project repository and author website
+- JSON schema for course modules
+- Fine-grained validation feedback for lessons
+- Keyboard shortcuts for editor tools and lesson navigation
+- Emmet pro tip in FAQ accordion lesson
+
+### Changed
+- Lesson schema to include concept field for explanations
+- Module layout from horizontal to Flexbox Froggy style with reordered panels
+- Logo design with new branding and clickable navigation
+- Preview iframe styling for better isolation and full-height display
+- Module pill to float in navigation bar with lesson counter
+- Hint bar to float over editor for better space utilization
+- Welcome lesson with comprehensive info and learning resources
+- Language display to show current language in dropdown format
+- Module name element updates instead of overwriting entire pill
+- Instruction element order with title first, module pill second
+- Task descriptions with improved clarity and friendlier values
+- Success message to "CRISPY!" with Japanese smiley emoticon
+- Lesson content styling with improved readability and accessibility
+- Mobile layout to show editor and preview in optimized order
+- CRISPY animation duration and visibility timing
+- Hamburger menu with cleaner CSS animation
+- Copyright year from 2025 to 2026
+- Transitions-animations difficulty level to intermediate
+- Meta description and title for HTML & CSS learning focus
+- Port configuration to 1234
+
+### Fixed
+- Mobile preview-header positioning above preview-wrapper
+- Mobile preview visibility with explicit flex display
+- Mobile editor minimum height for better usability
+- Module list max-height constraint removal
+- Placeholder text and loading indicators
+- HTML lesson task instructions format alignment with solution code
+- Race condition in error feedback closure timing
+- Code tags for quoted text in lesson messages
+- Preview iframe HTML/body minimum height for full coverage
+- Lesson content with improved kbd tags and syntax examples
+- Browser form restoration artifact from hidden textarea
+- WCAG compliance issues and keyboard accessibility
+- Box model task instructions format across all languages
+- Hello World lesson with proper HTML structure and paragraph tags
+- German translation consistency and completeness
+- Initialization bugs affecting level indicator and expected preview
+- Validation message casing and clarity
+- Module name truncation to mobile only
+- Layout issues for RTL text in Arabic
+- Logo positioning and animation centering
+- Editor scrolling behavior on lesson navigation
+
+### Improved
+- Lesson clarity with semantic HTML and proper element usage
+- CSS organization with section headers and sorted rules
+- Module descriptions for better user understanding
+- Validation rules for basic selectors and class selectors lessons
+- Progress bar styling with increased height and new background color
+- Lesson preview functionality and run button interaction
+- Code element styling and accessibility features
+- Sidebar transparency for better lesson focus
+- Layout performance with synchronous module loading
+- Button styling and interactive elements
+- Performance with code caching and module loading optimization