Dashboard: Invoice PDF Preview & Send Flow

[0xdevcollins]

Summary

Implement the invoice preview panel and the send-to-customer flow within the dashboard.

Requirements

• PDF preview panel showing rendered invoice with merchant branding
• Download PDF and Print buttons
• Send flow:
  • "Send Invoice" button opens modal
  • Fields: recipient email (pre-filled), custom message
  • Confirmation step before sending
  • Success toast on send
• Invoice detail view:
  • Full invoice data display
  • Activity timeline (created → sent → viewed → paid)
  • Payment details if paid (payment ID, method, date)
  • Actions: Edit (if draft), Send, Download, Cancel

Acceptance Criteria

• PDF preview matches final PDF output
• Send flow delivers email and updates status
• Activity timeline shows all state changes
• Toast notifications on success/error
• Works on mobile (375px)