FlowLeap v0.2.1

Fixed

• A rejected model-provider API key now says so. Chat previously ended the turn
  with the provider's own wording — OpenRouter answers an unrecognised key with
  "User not found." — followed by a stack trace, which read as though your
  FlowLeap account were missing rather than your key being wrong. The message
  now names the provider, tells you to check the key, and links Manage Models,
  keeping the provider's text as a supporting detail. A key that never reached
  the provider is reported differently from one that was refused.