fix(orders): resolve 64-hex order ids directly without re-hashing in dispatch and refund (closes #67)

[Ranjeet2063]

Summary of Changes

This PR resolves issue #67 where dispatchOrder and refundOrder (and readOrder) in lib/stellar/orders.ts unconditionally ran await hashOrderId(orderId). When called from app/admin/orders/page.tsx, the order ID is already the 32-byte event-derived SHA-256 hash formatted as a 64-character hex string. Re-hashing the 64-hex ASCII string produced a completely different SHA-256 digest, resulting in contract calls failing with OrderNotFound.

Key Changes

1. Helper resolveOrderIdHash in lib/stellar/orders.ts:
   • Pure, robust resolver that checks if orderId matches a 64-character hex string (^[0-9a-fA-F]{64}$, with optional 0x prefix and trimmed whitespace).
   • If already a 64-hex hash, it converts it directly via hexToBytes without re-hashing.
   • If a short raw pre-image (e.g. "SS-2024-0001"), it computes SHA-256 via hashOrderId.
2. Usage in Order Management Operations:
   • Used in dispatchOrder, refundOrder, and readOrder in lib/stellar/orders.ts.
   • Leaves app/admin/orders/page.tsx passing the indexer event-derived hex ID unmodified.
3. Comprehensive Unit Tests:
   • tests/lib/stellar/orders.test.ts: Verifies 64-hex bypass (lower/upper/mixed case, 0x prefix, whitespace) and SHA-256 computation for raw pre-images.
   • tests/app/admin/orders-dispatch.test.tsx: Asserts the admin page passes the event-derived hex ID directly to dispatchOrder and refundOrder without modification.

Verification (2x Verified)

• npx vitest run tests/lib/stellar/orders.test.ts tests/app/admin/orders-dispatch.test.tsx (8/8 tests pass, 0 warnings)
• npm run type-check (0 errors)
• npm run lint (0 errors)
• npx prettier --check (100% formatted)

Closes #67

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