chore: release v1.0.0

- Add comprehensive CHANGELOG.md with version history and roadmap
- Bump version to 1.0.0 in package.json
- Multi-user query with tab navigation
- Sticky header with collapsible filter panel
- Back to top button
- Mobile improvements
- Rating distribution with deduplication
- i18n support (zh/en)
- Dark mode with theme switcher

Author: TARS

CHANGELOG.md

@@ -0,0 +1,107 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+---
+
+## [Unreleased]
+
+### Planned Features
+
+- **Multi-user PK Mode**: Compare multiple users side-by-side with head-to-head statistics
+- **Leaderboard View**: Ranking system for competing users
+- **Activity Heatmap**: Visual timeline showing submission frequency patterns
+- **Problem Tag Analysis**: Breakdown of solved problems by category/tags
+- **Streak Tracking**: Consecutive days of problem solving
+- **Export Functionality**: Export statistics to CSV/JSON
+- **Dark Mode Improvements**: Better contrast and color schemes
+- **Performance Optimizations**: Virtual scrolling for large submission lists
+- **PWA Support**: Offline capability and installable app
+
+---
+
+## [1.0.0] - 2025-02-05
+
+### Added
+
+- **Multi-user Query**: Support querying up to 10 users simultaneously with tab-based navigation
+- **Sticky Header**: User info and filter panels stick to top when scrolling
+- **Collapsible Filter Panel**: Filter section can be expanded/collapsed, showing summary when collapsed
+- **Back to Top Button**: Floating button appears after scrolling down
+- **Mobile Responsive**: Website title now visible on mobile devices
+- **Footer Enhancements**: GitHub link button and improved author attribution (@cooper-xs, @yume, @TARS)
+- **Rating Distribution Filter**: Progress bars dynamically adjust based on selected filter (all/accepted/rejected)
+- **Deduplication Statistics**: Unique solved problems count displayed in rating distribution
+- **Date Range Selection**: Filter submissions by custom date range
+- **Internationalization**: Full Chinese and English language support
+- **Dark Mode**: Complete dark theme support with system preference detection
+- **Theme Switcher**: Light/Dark/System theme toggle in header
+
+### Changed
+
+- Improved progress bar visualization when filtering by accepted/rejected status
+- Refined user card layout and information hierarchy
+- Enhanced tab switching animation for multi-user view
+
+### Fixed
+
+- Progress bar scaling when filtered results have different max values
+- Emoji color consistency in author attribution
+- Scroll behavior with sticky headers to prevent content jumping
+
+---
+
+## [0.9.0] - 2025-02-04
+
+### Added
+
+- **Rating Distribution Visualization**: Show problem difficulty distribution with progress bars
+- **Problem Deduplication**: Count unique solved problems per rating range
+- **Filter by Rating Range**: Click on rating bars to filter submissions
+- **Result Filter Tabs**: Quick filter by All/Accepted/Rejected with counts
+- **Footer**: Basic footer with Codeforces attribution and author credits
+
+### Changed
+
+- Improved submission list layout with difficulty badges
+
+---
+
+## [0.5.0] - 2025-02-03
+
+### Added
+
+- **Basic User Query**: Search Codeforces users by handle
+- **Submission List**: Display user submissions with verdict, time, and language
+- **Batch Query**: Support comma-separated handles for batch lookup
+- **Tag Input Interface**: Add/remove users with keyboard shortcuts
+- **Date Filtering**: Filter submissions by preset date ranges (today, yesterday, last 7/30 days)
+
+---
+
+## [0.1.0] - 2025-02-02
+
+### Added
+
+- Initial project setup with React + TypeScript + Vite
+- Tailwind CSS integration
+- Basic project structure and component architecture
+
+---
+
+## Versioning Policy
+
+- **MAJOR**: Breaking changes or major feature additions
+- **MINOR**: New features, enhancements (backward compatible)
+- **PATCH**: Bug fixes, minor improvements
+
+## Release Process
+
+1. Update `CHANGELOG.md` with new version and changes
+2. Update version in `package.json`
+3. Create git tag: `git tag -a v1.0.0 -m "Release version 1.0.0"`
+4. Push tag: `git push origin v1.0.0`
+5. Deploy: `./deploy.sh prod`

package.json

@@ -1,7 +1,7 @@
 {
   "name": "cf-daily-tracker",
   "private": true,
-  "version": "0.0.0",
+  "version": "1.0.0",
   "type": "module",
   "scripts": {
     "dev": "vite",