[Gaubee]

Summary

• enforce miniapp transfer amount as raw integer string only
• convert raw amount to human-readable display in transfer confirm sheet
• ensure transaction build/broadcast always uses raw amount semantics
• add regression tests for display/build behavior and invalid non-raw input

Verification

• pnpm vitest run src/stackflow/activities/sheets/tests/miniapp-transfer-amount.test.ts src/stackflow/activities/sheets/MiniappConfirmJobs.regression.test.tsx

Notes

• No local changes detected in vite.config.ts in this workspace at submit time.