Create a new AccountDetails page that shows account information and all linked cards. This replaces the standalone Cards page and nests card management under accounts, as cards are always linked to accounts.
Features:
- View account details (institution, type, owner, etc.)
- List all cards linked to the account
- Add new cards directly from the account page
- Edit and delete cards within the account context
- Click-through navigation from Accounts list
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Co-Authored-By: Claude <noreply@anthropic.com>
