fix: give mainnet and testnet wallets separate keys

[Yamaguchi]

Summary

Switching between mainnet and testnet in the extension only changed which explorer it talked to — the wallet's address and private key stayed exactly the same on both networks. Traced to @tapylet/core always deriving the key with the testnet coin type, whichever network was selected.

Details

Mainnet and testnet now derive genuinely separate keys (see the companion @tapylet/core change). Addresses stay in the prod format on both networks; only the derivation path's coin type differs. A wallet created from now on gets both keys up front. An existing wallet gets its missing keys derived right after unlock; its previous single address is carried forward untouched as a "legacy mainnet address" — real funds may be sitting there — rather than recomputed, and a one-time notice tells the user their mainnet address has changed and where the old one went.

Changes

• PasswordSetupScreen: derive and store both mainnet/testnet keys on creation.
• UnlockScreen + storage/migrations.ts#ensureWalletNetworkKeys: backfill missing per-network keys after unlock; each network is derived independently so one failing doesn't block the other.
• New screens: LegacyMigrationNoticeScreen (one-time notice), MissingNetworkKeyScreen (retry when a key failed to derive), LegacyAddressScreen (view balance / send from the legacy mainnet address, reachable from Settings).
• SendModal takes an explicit networkId and an optional fromLegacyMainnetWallet flag, reused by both normal sends and legacy-address sends.
• WalletData moved from a single address/publicKey to networks: Record<networkId, {address, publicKey}> plus legacyMainnetAddress.
• Bump @tapylet/core to ^0.0.8.

Impact

• Every existing installed wallet: on first unlock after this update, the mainnet address shown changes to a freshly derived one. The previous address, and any funds on it, is reachable from Settings → "Previous mainnet address".
• The previous address is the same as the new testnet address, since both use the same derivation path and address format.

Verification Steps

• npm test — 128 tests
• npx tsc --noEmit
• pnpm build
• Needs a load-unpacked run through: create a wallet (check both addresses differ), unlock an existing wallet (check the migration notice and the legacy address screen), switch networks, send from the legacy address.

Related Issues

chaintope/tapylet-core#8

Notes

• Companion change: fix: derive separate keys for mainnet and testnet tapylet-core#8, released as @tapylet/core 0.0.8.
• tapylet-for-mobile has the same fix in chaintope/tapylet-for-mobile#28.

[Yamaguchi]

ロック解除時(1回だけ表示)

設定画面

「確認する」クリック時

「新しいアドレスに送金する」クリック時