[Angnuo (angnuoli)]

Description

Restore a removal action for configured Qwen and MiniMax connections. Managed providers intentionally hide the saved-model row list, which also hid the only existing removal action and prevented users from returning to an unconfigured state.

Related Issue

No linked issue.

Changes

• Add a provider-level Remove connection action with a confirmation dialog.
• Remove the selected provider's connection and saved API key, model aliases, and associated default/agent model references.
• Allow removing the last configured provider without choosing another model automatically.
• Preserve conversations, other providers, security policies, and external credentials/environment variables.
• Block removal during streaming, recovery, and model operations, and retain optimistic-concurrency checks.
• Add English/Chinese copy and regression coverage for removal, cancellation, stale writes, and busy states.

Type of Change

• Bug fix (non-breaking change that fixes an issue)

Testing

• Complete renderer suite: 42 test files, 558 tests passed (vitest run).
• Renderer production build (npm run build in desktop/renderer).
• Prettier check for all six changed files.
• Targeted renderer ESLint: no errors; existing file warnings remain.
• git diff --check.
• Manual installed-app testing (not performed; the user's real credentials were not changed).

Checklist

• Changes are isolated from unrelated work in the original working directory.
• Self-review performed.
• Regression tests added.
• Conversations and unrelated settings are preserved.