#9 Issue 9: [Feature] Download Tax Invoice

[elizabetheonoja-art]

Description:
Businesses need invoices for their energy usage. Generate a PDF with VAT breakdown.

Acceptance Criteria:

[ ] Use jspdf.

[ ] Include: Provider Address, User Address, Total Paid, Date Range, VAT (if applicable).

[ ] "Download PDF" button in Transaction History.

Priority: High
Labels: legal, feature