Add a rejected invoice banner on the seller dashboard explaining why the invoice was not approved

[Chucks1093]

Summary

When an invoice is rejected by an admin, sellers currently have no in-app explanation of why. A banner on the invoice detail page (visible only to the owning seller) should display the rejection reason so sellers can correct and resubmit.

Scope

• Show a red banner below the invoice title when the invoice status is rejected
• Banner text: 'This invoice was not approved: {rejection_reason}'
• Banner only visible to the authenticated seller who owns the invoice
• Include a 'Edit and Resubmit' button that navigates to the invoice edit form pre-populated with existing data
• Hide the banner for all other statuses

Acceptance Criteria

• Red banner visible to the owning seller when status is rejected
• Rejection reason displayed in the banner
• Banner hidden for all other statuses
• Banner not visible to other wallets viewing the invoice
• 'Edit and Resubmit' button navigates to pre-populated edit form

ETA: 12 hours

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Coordinate on Telegram