Built-in Synthetic provider: "Authorization header required" + ghost models persist after disabling

Version

OpenCode Desktop v1.18.4, Windows 10, active Synthetic API key (syn_...)

Context

After resetting OpenCode state (to recover from a separate WSL crash), the built-in Synthetic provider stopped working.

Problem 1: Authorization header required

Error returned: Unauthorized: Authorization header required. (previously Invalid API Key)

• The API key is valid and active.
• Direct curl/PowerShell test against https://api.synthetic.new/openai/v1/chat/completions works correctly with the same key.

Workaround: I created a custom OpenAI-compatible provider in OpenCode (ID: synthetic-custom, baseURL: https://api.synthetic.new/openai/v1) — everything works fine with the same key.

Problem 2: Ghost models in the selector

When the built-in Synthetic provider is disabled, its models (GLM 5.2, GLM 5.2 (syn:large:text), etc.) remain visible in the model selector. Manual removal one by one via right-click is required.

Suggestions

1. Fix the built-in Synthetic provider so it correctly sends the Authorization header after a state reset.
2. Automatically hide models belonging to a disabled/disconnected provider.
3. Add a "Remove all models from this provider" option in settings.