fix: recover correct BSC sender in biobridge recharge

[Gaubee]

Summary

• fix EVM signing canonicalization for zero hex quantities (0x0 -> 0x) before RLP signing
• add regression test to ensure recovered sender matches signing key for token transfer payloads
• add biobridge recharge safeguards: chain/account mismatch check, sender/receiver preview, reconnect wallets action
• add i18n copy for new UX/error states

Validation

• pnpm vitest run src/services/chain-adapter/evm/transaction-mixin.test.ts
• pnpm --filter @biochain/miniapp-biobridge test:run -- src/App.test.tsx src/hooks/useForge.test.ts
• pnpm --filter @biochain/miniapp-biobridge typecheck:run