fix: prioritize sBTC in send token list after BTC and STX

## Summary Fixes #6270 - Token ordering now shows BTC, STX, sBTC first in the send page. ## Changes - Modified `sip10-token-asset-list.tsx` to sort SIP10 tokens with sBTC prioritized - Used `useConfigSbtc().isSbtcContract()` to identify sBTC tokens ## Testing - `pnpm typecheck` passes - ESLint passes with no new errors @314159265359879