Important

Refactor AccountView to use Roo logo for unknown users and update localization files for consistency.

• UI Changes:
  • In AccountView.tsx, replace default user icon with Roo logo when userInfo is null.
  • Adjust spacing and layout in AccountView.tsx for better alignment.
• Localization:
  • Remove signUpTitle and signUpDescription keys from all language files.
  • Update signIn key value in all language files to "Connect to Roo Code Cloud" or equivalent.

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