Build invoice recipient onboarding

[Kingsman-99]

Label: complexity: high
Points: 200

Description

First-time recipients receiving a payment have no guidance on what to do. This issue adds a recipient-specific onboarding flow triggered when a wallet connects and is found to be a recipient on any invoice — explaining what StellarSplit is and how to track their incoming payment.

Technical Context

Involves layout.tsx and a new src/components/RecipientOnboarding.tsx. After wallet connects, check splitClient.getInvoicesByRecipient(). If results exist and recipientOnboarded not in localStorage, show a 3-step modal: (1) you have incoming payments, (2) how release works, (3) go to recipient portal.

Acceptance Criteria

• Onboarding triggers for first-time recipients only
• 3-step modal with progress indicator
• Step 1 shows count of invoices they are a recipient on
• Step 3 links to /recipient portal page
• Completion sets recipientOnboarded in localStorage
• Mobile responsive — works on 375px screens
• No TypeScript errors

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[Emoji-dot]

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[Happybello365]

@Happybello365 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hello i would like to work on this issue

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Congratulations, @Happybello365! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

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This issue has been completed by @Happybello365 as part of the Stellar Wave Program's 5th Wave 🥳

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