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defiQUG bee1d29d55 Add full Chain 138 integration: 8 steps, chain spec, app-ethereum config, docs

Co-authored-by: Cursor <cursoragent@cursor.com>

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hw-app-eth-usage.ts

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network-entry-chain138.c

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README.md

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Step 2 — Device app lib

EVM/Chain 138: Use existing @ledgerhq/hw-app-eth; no new device app lib. Ensure chainId: 138 in transaction building/signing.
app-ethereum (C): If upstream Ledger app-ethereum does not list Chain 138, add the line from network-entry-chain138.c to src/network.c. Our fork already has it at pr-workspace/app-ethereum/src/network.c line 42.
Icons: If Ledger requires a network icon, use their icon process (see Device App Kit docs). Chain 138 can share the generic Ethereum-style icon until a custom one is added.