[Bug][Critical] 'Create New Wallet' silently creates duplicate wallets without warning

[hartsring]

Description

Clicking "创建新钱包" creates a brand new wallet every time without warning the user that wallets already exist. During testing, 5 wallets were accidentally created.

Steps to Reproduce

1. Create a wallet
2. Navigate away and return to welcome screen
3. Click "创建新钱包" multiple times

Expected Behavior

User should be warned if wallets already exist and asked to confirm before creating a new one.

Actual Behavior

New wallet created silently each time. Users may lose access to previous wallet funds.

Severity

Critical — potential loss of user funds