Function clearAccount

clearAccount(context: ExtensionContext): Promise<void>
Clears all cached Blackboard session data, including:
- SecretStorage credentials
- Persistent cookies
- Stored ICS URL
Can be used when switching accounts or troubleshooting auth errors.
Parameters
- context: ExtensionContext
  VS Code extension context
Returns Promise<void>
- Defined in src/backend/commands/clearAccount.ts:19