feat: redirect to pool detail page after creation

[dev-fani]

After pool creation is confirmed on-chain, the user is now redirected to the newly created pool's detail page.

Changes Made

• After submitSignedXdr() succeeds, redirect to /pools/{poolId} using router.push()
• Removed SuccessScreen component and submitted state since we now redirect directly
• Added parseApiError import for proper error handling
• Pool ID is captured from the createPool() response and used for the redirect

Deliverables

• ✅ After submitSignedXdr() succeeds: calls router.push(/pools/\${poolId})
• ✅ TypeScript validation passes (no diagnostics in modified file)
• ✅ Code follows existing patterns in the file

Testing

The implementation follows the existing flow:

1. User creates a pool (form submission)
2. createPool() API returns { id, unsignedXdr }
3. User signs the transaction via Freighter
4. submitSignedXdr() submits the signed transaction
5. NEW: On success, redirect to /pools/{poolId} (pool detail page)

Dependencies

Depends on #86 (submitSignedXdr implementation)

Notes

• The pool ID comes from the original createPool() response as specified
• On error, the user remains on the form with error feedback
• The CI build will validate the changes properly with env vars configured

Closes #723

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[dev-fani]

hello maintainer, please merge my pr