Add USDC (testnet SAC) as a stream token

Streams currently only use native XLM (XLM_SAC in frontend/src/lib/config.ts). The contract already accepts any SAC token.

Tasks

Add a token selector to NewStreamModal (XLM, testnet USDC).
Register USDC in TOKENS with correct decimals.
Show the right code in stream cards and Earnings (Earnings currently filters to XLM only).
Handle the trustline case: show a clear message if the recipient has no USDC trustline.

Acceptance: a USDC stream can be created, accrues, and withdraws on testnet; unit test for token metadata.

I have implemented USDC (testnet SAC) stream token support in Pull Request #27: #27

USDC SAC Registration: Configured Circle testnet USDC SAC (CBIELTK6YBZJU5UP2WWQEUCYKLPU6AUNZ2BQ4WWFEIE3USCIHMXQDAMA) and SUPPORTED_TOKENS list in src/lib/config.ts.
Token Selector: Added interactive token switcher (XLM / USDC) in NewStreamModal.
Trustline Validation: Integrated hasTrustline check against Horizon API to alert senders if recipient lacks a USDC trustline before transaction submission.
Multi-Token Streams & Earnings: Updated TopUpSheet to handle token-specific decimals, and added multi-token filter (All / XLM / USDC) in EarningsPage.
Test Suite: Added unit tests in src/lib/__tests__/tokens.test.ts. 85/85 vitest tests pass and TypeScript check is 100% clean.

Bounty Payout Wallet (TRC20 TRX/USDT):
TMqmJjRgVS21NL2eFtfyHciTxvE4BqGmEv

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