[Frontend] TransactionTracker re-implements formatAmount locally — use shared util

[ogazboiz]

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

Why this matters

frontend/src/components/TransactionTracker.tsx defines its own private formatAmount(raw, decimals) at the bottom of the file, duplicating the canonical helper that already exists in lib/amount.ts / utils/amount.ts. This is a third copy of the same i128→display logic and can drift (e.g. its BigInt(10 ** decimals) differs from the 10n ** BigInt(decimals) form used elsewhere, which is fine for 7 but fragile).

Acceptance criteria

• Import formatAmount from the shared amount util instead of the local copy
• Delete the local formatAmount definition
• Component renders identically; tests pass

Files to touch

• frontend/src/components/TransactionTracker.tsx

Out of scope

• The lib/amount vs utils/amount consolidation ([Frontend] Consolidate duplicate amount helpers in lib/amount.ts and utils/amount.ts #520) — depend on whichever it standardises on.

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