[Frontend] Remove dead no-op validation block in AmountStep.handleAmountChange

[ogazboiz]

Telegram: https://t.me/+DOylgFv1jyJlNzM0

Why this matters

frontend/src/components/stream-creation/AmountStep.tsx has a handleAmountChange whose precision-validation branch is an empty block containing only comments:

if (newValue && !hasValidPrecision(newValue, 7)) {
  // Parent component should handle this error
  // This validation can be used to show inline error if needed
}

It does nothing — hasValidPrecision is called and the result discarded. Either wire it to surface an inline error, or drop the dead branch (and the now-unused hasValidPrecision import).

Acceptance criteria

• Remove the empty if block (and unused import) OR implement the inline precision error
• Lint passes with no unused import

Files to touch

• frontend/src/components/stream-creation/AmountStep.tsx

Out of scope

• The wizard's step-level validation in StreamCreationWizard.

[uzochukwuV]

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[Litezy]

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