## New Features

### 1. Session Checkpoint System
- Add CheckpointPanel component for managing conversation checkpoints
- Implement checkpoint CRUD operations (create, read, update, delete)
- Support checkpoint restoration to previous conversation states
- Add keyboard shortcut (⇧⌘P/Ctrl+Shift+P) to toggle checkpoint panel
- Persist checkpoints to localStorage with session association

### 2. Auto-Checkpoint System
- Implement automatic checkpoint creation based on message intervals
- Add configurable settings:
  - Enable/disable auto-checkpoint
  - Message interval (default: 10 messages)
  - Checkpoint name prefix customization
- Auto-checkpoint triggers after each assistant message
- Configuration persisted to localStorage

### 3. Usage Analytics Panel
- Add UsagePanel component to display token usage statistics
- Show input/output tokens and estimated costs
- Support per-session token tracking
- Pricing information for different Claude models

### 4. CLAUDE.md Editor
- Add ClaudeMdEditor component for editing project instructions
- Integrate with ConfigPanel for easy access
- Support direct file editing through Tauri backend

### 5. Git Integration Enhancements
- Improve GitStatus component UI and functionality
- Add comprehensive git operation tests
- Enhanced git command support in Rust backend

### 6. Terminal Improvements
- Add light mode theme support for terminal
- Improve terminal theme switching
- Better PTY session management

## Technical Changes

### Frontend
- `src/stores/app.ts`: Add auto-checkpoint configuration
- `src/stores/chat.ts`: Implement auto-checkpoint logic
- `src/stores/session.ts`: Add checkpoint management methods
- `src/stores/usage.ts`: New store for usage analytics
- `src/types/session.ts`: Add Checkpoint interface

### Backend
- `src-tauri/src/commands/git.rs`: Enhanced git operations
- `src-tauri/src/lib.rs`: Register new git commands

### Tests
- Add integration tests for git status functionality
- Add integration tests for sidebar interactions
- All 173 tests passing ✓

## Fixes
- Resolve TypeScript type errors
- Fix ESLint formatting issues
- Improve error handling in checkpoint operations

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <[email protected]>

## Updates

### New Features Documentation
- Add comprehensive Checkpoint System section
  - Manual and auto-checkpoint workflows
  - Storage structure and key components
- Add Git Integration section
  - All git commands with correct names
  - Component and test file references
- Add Usage Analytics section
  - Token tracking and cost analytics
  - Storage limits and export functionality

### Enhanced Testing Documentation
- Split testing into Unit/Integration/E2E sections
- Add Playwright E2E testing details
- Add Git hooks and lint-staged configuration
- Include commands for running specific test types

### New Development Commands
- Add E2E testing commands (test:e2e, test:e2e:ui, test:e2e:headed)
- Add test:ui and test:all commands
- Add format:check command

### Pattern Documentation
- Add "Working with Checkpoints" pattern guide
- Update "Adding New Models" to include usage store

### Corrections
- Fix auto-checkpoint config property name: autoCheckpoint → autoCheckpointConfig
- Fix default checkpoint prefix: "Auto" → "自动检查点" (Chinese)
- Fix git command names: git_status → get_git_status, etc.
- Remove non-existent git_diff command
- Fix checkpoint tracking variable: lastMessageIndex → lastAutoCheckpointMessageCount
- Update terminal theme gotcha to reflect light/dark mode support

### Enhanced Gotchas
- Add Checkpoint-Specific Gotchas section
- Add Usage Analytics Gotchas section
- Add i18n consideration for checkpoint prefix

## Verification
- All 173 tests passing
- All commands verified working
- Architecture descriptions match codebase
- All referenced files and components exist

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <[email protected]>