Add Time Entry Tracking and Invoice Calculation Features

[sweep-ai]

This pull request was created by Sweep to resolve the following request by @curtisdelicata:

Description: Add a system for tracking billable hours.

Tasks:
Create TimeEntry model and migration.
Develop UI for adding time entries for clients.
Link time entries to invoices for billing purposes.
Acceptance Criteria:
Users can track billable hours.
Time entries are linked to invoice generation.

Continue chatting at https://sweep-chat-demo.vercel.app/c/3ad35fd1-cb4d-4197-834f-8d925dbf3b06.

Purpose

Implement a comprehensive time tracking system that allows users to log work hours, associate them with customers and invoices, and automatically calculate billable amounts.

Description

This pull request introduces a new time entry tracking feature for the accounting system. The implementation includes:

• A new TimeEntry model to capture detailed work time information
• Database migration for creating the time_entries table
• Filament resource for managing time entries
• Enhanced invoice calculation methods to incorporate time entry totals
• Relationships between time entries, customers, and invoices

The feature enables users to:

• Create time entries with start and end times
• Associate time entries with specific customers
• Optionally link time entries to invoices
• Automatically calculate total billable amounts based on hourly rates
• View and manage time entries through a Filament resource

Summary

• Added new TimeEntry model with comprehensive attributes
• Created database migration for time_entries table
• Implemented Filament resource for time entry management
• Extended Invoice model with time entry calculation method
• Added relationships between TimeEntry, Customer, and Invoice models
• Introduced automatic total amount calculation for time entries