migrate from ethers to viem

- Replace HDNodeWallet.fromPhrase with mnemonicToAccount from viem/accounts
- Replace JsonRpcProvider.getBalance with viem createPublicClient + getBalance
- Replace formatEther with viem's formatEther (same API)
- Remove ethers dependency from package.json
- Update README

README.md

@@ -67,8 +67,7 @@ apps/desktop/
 
 ## Dependencies
 
-- [Ethers](https://docs.ethers.org) — EVM wallet operations
-- [Viem](https://viem.sh) — EVM chain RPC calls
+- [Viem](https://viem.sh) — EVM chain RPC calls + wallet operations
 - [monero-ts](https://github.com/woodser/monero-ts) — Monero RPC client
 - [Drizzle ORM](https://orm.drizzle.team) — SQLite schema + queries
 - [Svelte 5](https://svelte.dev) — UI framework

apps/desktop/package.json

@@ -19,7 +19,6 @@
 		"@koins/utils": "workspace:*",
 		"drizzle-orm": "^1.0.0-beta.22",
 		"electrobun": "^1.18.1",
-		"ethers": "^6.16.0",
 		"mode-watcher": "^1.1.0",
 		"monero-ts": "^0.11.8",
 		"qrcode": "^1.5.4",

apps/desktop/src/lib/states/wallet.svelte.ts

@@ -1,4 +1,5 @@
-import { JsonRpcProvider, HDNodeWallet, formatEther } from 'ethers'
+import { mnemonicToAccount } from 'viem/accounts'
+import { createPublicClient, http, formatEther } from 'viem'
 import { electrobun, type TxEntry, type MoneroTxEntry, type MoneroAccountEntry } from '$lib/electrobun'
 import { tryCatch } from '@koins/utils'
 
@@ -180,7 +181,7 @@ export const Wallet = () => {
 		loading = true
 		error = ''
 		try {
-			HDNodeWallet.fromPhrase(phrase.trim())
+			mnemonicToAccount(phrase.trim())
 			await electrobun.rpc?.request.setSecret({
 				service: 'koins',
 				name: 'vault',
@@ -293,11 +294,11 @@ export const Wallet = () => {
 		loading = true
 		error = ''
 		tokenBalances = []
-		const wallet = HDNodeWallet.fromPhrase(seed)
-		address = wallet.address
-		const provider = new JsonRpcProvider(net().rpc)
+		const account = mnemonicToAccount(seed)
+		address = account.address
+		const client = createPublicClient({ transport: http(net().rpc) })
 		const [nativeBal, nativeBalError] = await tryCatch(
-			provider.getBalance(wallet.address),
+			client.getBalance({ address: account.address }),
 		)
 
 		if (nativeBalError) {
@@ -309,7 +310,7 @@ export const Wallet = () => {
 
 		const [bals, balsError] = await tryCatch(
 			electrobun.rpc.request.fetchTokenBalances({
-				address: wallet.address,
+				address: address,
 				chainid: net().chainid,
 			}),
 		)