[Frontend] Create-stream token select offers unsupported FLOW and omits supported EURC

[ogazboiz]

Telegram: https://t.me/+DOylgFv1jyJlNzM0

Why this matters

The token <select> in frontend/src/app/streams/create/page.tsx offers XLM, USDC, FLOW. But getTokenAddress (in frontend/src/lib/soroban.ts) only resolves USDC, XLM, EURC from TOKEN_ADDRESSES. Selecting FLOW throws SorobanCallError("Unsupported token: FLOW") on submit, while EURC (which the contract supports) isn't selectable. The options list doesn't match the resolvable tokens.

Acceptance criteria

• Make the select options derive from TOKEN_ADDRESSES keys (or at least replace FLOW with EURC)
• Submitting any offered token succeeds through getTokenAddress

Files to touch

• frontend/src/app/streams/create/page.tsx
• (reference) frontend/src/lib/soroban.ts TOKEN_ADDRESSES

Out of scope

• Adding new token contracts.

[dmystical-coder]

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