Switch accounts without getting stuck

The locked Membership screen now makes the current account clear and provides a direct Use another email action. Choosing it securely ends that session and opens a fresh sign-in, so a paid account under another address is never trapped behind the pricing screen.

• The signed-in email appears beside the account-switch action.
• The header points to Account options instead of looping back into the locked app.
• Starting a trial, recovering billing, and downloading account data remain available for the current email.
• Phone and desktop layouts keep the action visible, compact, and easy to tap.