feat: Sadaqah donation page with on-chain transparency and SEP-7 QR payments

[zeemscript]

What

Deepens the platform's Stellar integration on the client side:

1. Sadaqah donation page (/dashboard/sadaqah, added to the dashboard nav): donate USDC to the scholarship fund with the connected wallet (Freighter/xBull/Albedo). Shows live, Horizon-backed fund transparency — pool balance, total donated, donation count, and recent donations with stellar.expert links.
2. useStellarDonation hook mirroring useStellarPayment: initialize → sign in wallet → submit, with the same error taxonomy (insufficient balance, missing trustline, user cancelled).
3. SEP-7 payment QR codes (Sep7QrCode component, qrcode.react): scan-to-pay with a Stellar mobile wallet, shown in the donation flow and as an optional 'Pay by QR' section in PaymentModal when the API returns sep7Uri (no-op when absent).

Depends on

The dnb-backend feat/stellar-deep PR (donation endpoints + sep7Uri in initialize responses). This UI degrades gracefully until then: stats show an error/unconfigured state, and the QR section simply doesn't render. Merge the backend PR first.

Testing

• npm run lint and npm run build pass; /dashboard/sadaqah in the route manifest
• Lockfile regenerated with npm 10 and verified against npm ci (CI's npm)
• All UI states handled: wallet not connected, API error, 503 unconfigured, user cancels signing

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Project	Deployment	Actions	Updated (UTC)
dnb-frontend	Ready	Preview, Comment	Jul 14, 2026 1:25pm