fix: Guard provider verification when the provider is disabled

[Copilot]

The settings page allowed users to run provider/model verification even when the provider itself was disabled. That path surfaced a misleading Provider not initialized error although the provider could still work once enabled.

• What changed

  • Disabled verification entry points when provider.enable === false.
  • Added no-op guards to verification handlers so disabled providers do not open the model-check dialog or trigger inline credential checks.
  • Covered both the shared provider settings flow and provider-specific verification paths.

• UI / behavior

  • Shared provider verify button is now disabled for disabled providers.
  • Pressing Enter in the API key field no longer triggers verification for a disabled provider.
  • Provider-specific verify actions (Ollama, GitHub Copilot, Bedrock, Vertex) now respect the same enabled-state guard.

• Regression coverage

  • Added focused renderer coverage for the shared ProviderApiConfig verification flow:
    • disabled provider => verify button disabled
    • disabled provider => API key enter shortcut does not emit validation

• Relevant implementation

  const canVerifyProvider = computed(() => props.provider.enable)
  
  const openModelCheckDialog = () => {
    if (!canVerifyProvider.value) {
      return
    }
  
    modelCheckStore.openDialog(props.provider.id)
  }

• Docs

  • Added a small SDD issue folder documenting the bug, scope, and task breakdown under:
    • docs/issues/provider-validation-disabled/

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• cdn.sheetjs.com
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node node /home/REDACTED/work/_temp/ghcca-node/node/bin/pnpm install (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)