[Bug] Dashboard SET MAIN MODEL freezes/black screen when selecting named custom provider

Environment

• Hermes Agent version: v0.14.0 (2026.5.16)
• OS: macOS 26.4.1
• Python: 3.14.5

Custom Provider Configuration

providers:
  qwen36mtp8081:
    type: openai
    base_url: http://127.0.0.1:8081/v1
    api_key: ""
    models:
      - id: qwen36-mtp
        name: Qwen3.6 MTP

Model Server Status (8081)

• Health: ok
• /v1/models: ["qwen36-mtp"]
• n_ctx: 8192

Reproduction Steps

1. Open Hermes Dashboard
2. Go to SET MAIN MODEL screen
3. Select the custom provider qwen36mtp8081 (or qwen36-mtp)
4. UI freezes into black screen (no model detail panel, no CHANGE/SWITCH buttons appear)

Expected Behavior

• Selecting a named custom provider should show model details and allow switching.

Actual Behavior

• Dashboard turns black / freezes completely when selecting the custom provider.
• Default providers (xai-oauth, gemini) work normally.

Additional Information

• YAML structure of config.yaml has been verified and fixed (no indentation errors).
• The issue appears to be in the Dashboard custom provider picker UI, not the model server itself.
• credential_pool_strategies was previously leaking into the provider list due to config structure issues (now resolved).

Required Evidence (to be attached by reporter)

• Dashboard screenshot when the black screen occurs
• Browser console errors (if any) when selecting the custom provider
• Full config.yaml (with secrets redacted)

Workaround

Directly editing ~/.hermes/config.yaml + hermes gateway restart works, but the Dashboard UI cannot be used to switch to the custom provider.

Suggested Labels

bug, dashboard, custom-provider, ui-freeze