fix: preserve exact faucet amounts in wei

[MuncleUscles]

Summary

• parse GEN decimal input directly to bigint without floating-point conversion
• send exact decimal wei strings over JSON-RPC
• reject unsupported precision and scientific notation

Verification

• focused Vitest suite (2 passed)
• Vue TypeScript check
• pre-commit ESLint and Prettier hooks

[coderabbitai]

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