Fix XRPL EVM chain icons (1440000 / 1449000 / 1449900)

[vriveraPeersyst]

Problem

XRPL EVM Mainnet (1440000), Testnet (1449000) and Devnet (1449900) all render the default /unknown-logo.png instead of the XRPL EVM logo.

Root cause

ChainList builds the chain logo from constants/chainIds.js (the chain slug), not from the icon metadata field:

// components/chain/index.js (and the chain/add-network pages)
const icon = chain.chainSlug
  ? `https://icons.llamao.fi/icons/chains/rsz_${chain.chainSlug}.jpg`
  : "/unknown-logo.png";

• 1440000 had slug xrpl_evm → rsz_xrpl_evm.jpg returns 404.
• 1449000 / 1449900 had no chainIds.js entry → chainSlug is undefined → falls back to /unknown-logo.png.

The real CDN files are rsz_xrpl-evm.jpg / rsz_xrpl%20evm.jpg (both HTTP 200). DefiLlama's own chain name for 1440000 is XRPL EVM (api.llama.fi/chains), and the chainIds.js convention is the DefiLlama name lowercased with spaces preserved (e.g. nova network, x layer, zksync era).

Fix

constants/chainIds.js:

• 1440000: xrpl_evm → xrpl evm — matches DefiLlama's chain name, so it fixes the icon and restores the TVL lookup.
• 1449900: add xrpl-evm (devnet icon).
• 1449000: add xrpl-evm (testnet icon; the hyphen intentionally differs from xrpl evm so the testnets don't falsely inherit the mainnet's TVL).

Also aligns the 1440000 override icon field with ethereum-lists (xrplevm) for API/data consistency — no display impact.

Verification

rsz_xrpl%20evm.jpg  -> 200   (1440000)
rsz_xrpl-evm.jpg    -> 200   (1449900, 1449000)

node tests/check-duplicate-keys.js passes.

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