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Implement a complete expense tracking feature that allows users to record, manage, approve, and track business expenses with full integration into existing project management and invoicing systems. Features: - Create and manage expenses with detailed information (amount, category, vendor, receipts, tax tracking) - Multi-currency support (EUR, USD, GBP, CHF) - Approval workflow with admin oversight (pending → approved → rejected) - Reimbursement tracking and status management - Billable expense flagging for client invoicing - Receipt file upload and attachment - Project and client association with auto-client selection - Tag-based organization and advanced filtering - CSV export functionality - Analytics dashboard with category breakdowns - API endpoints for programmatic access Database Changes: - Add expenses table with comprehensive schema - Create Alembic migration (029_add_expenses_table.py) - Add composite indexes for query performance - Implement proper foreign key constraints and cascading Routes & Templates: - Add expenses blueprint with 14 endpoints (CRUD, approval, export, API) - Create 4 responsive templates (list, form, view, dashboard) - Implement advanced filtering (status, category, project, client, date range) - Add permission-based access control (user vs admin) - Integrate receipt file upload handling User Experience: - Add "Expenses" to Insights navigation menu - Auto-populate client when project is selected - Provide visual feedback for auto-selections - Display summary statistics and analytics - Implement pagination and search functionality Testing & Documentation: - Add 40+ comprehensive tests covering models, methods, and workflows - Create complete user documentation (docs/EXPENSE_TRACKING.md) - Add API documentation and examples - Include troubleshooting guide and best practices Integration: - Link expenses to projects for cost tracking - Associate with clients for billing purposes - Connect billable expenses to invoicing system - Add PostHog event tracking for analytics - Implement structured logging for audit trail Security: - Role-based access control (users see only their expenses) - Admin-only approval and reimbursement actions - CSRF protection and file upload validation - Proper permission checks on all operations This implementation follows existing codebase patterns and includes full test coverage, documentation, and database migrations per project standards.