bryantbrock billing-saas .cursorrules file for TypeScript

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**Project Overview:**
This application assists independent software engineers in managing multiple clients by streamlining tasks such as time tracking, billing, and invoicing. Key features include:
- Home page: Start time tracking (select client, add description) and display a list of clients.
- Client detail page: Monitor time per client, view entries in a table with statuses ('billable', 'billed', 'paid'), and manage rates.
- 'Send Invoice' button: Generates and sends customizable invoices via email.
- 'Collect Payment' button: Records payments and updates entry statuses to 'paid'.