Added read-only proof of payment display in bill edit form:
- Shows download link when proofOfPaymentType is "per-bill" and proof exists
- Uses TicketIcon with teal color for visual distinction
- Links to /share/proof-of-payment/per-bill/ download route
- Handles housekeeping case (no display if filename missing)
This allows users to view and download existing proof of payment
while editing a bill, improving transparency and user experience.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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