feat: add hidden email input to password reset form for password manager

[HarshMN2345]

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Summary by CodeRabbit

• New Features
  • Email is auto-populated from the URL into an off-screen hidden email field (for credential helpers); it is not submitted with the form.
  • Autocomplete enabled for "New password" and "Confirm password" inputs (autocomplete="new-password").
  • Password fields now accept more flexible autocomplete behavior to better support different password managers.
  • No layout or navigation changes; existing password bindings and submission behavior remain unchanged.