fix(tui): add provider refresh action

[PaiduiXiaowangzi]

Related Issue

Part of #2111

Problem

The /provider command advertises refresh support, but the Provider Manager exposes only add and delete actions. Provider and model state also reloads only when a refresh reports model-list changes, so the TUI can retain stale configuration state.

What changed

• Add an R refresh action and visible key hint to Provider Manager.
• Run the existing provider refresh flow with progress and failure feedback, then reopen the manager with the latest state.
• Reload configured providers and models after every completed refresh, including unchanged results.
• Add component and controller regression coverage.

This intentionally leaves models.dev provenance and unsupported-provider discovery out of scope.

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue, or explained the problem above.
• I have added tests that prove my feature works.
• Ran gen-changesets skill and added a patch changeset.
• Ran gen-docs skill; no docs update is needed because this implements refresh behavior already advertised by /provider.

[changeset-bot]

🦋 Changeset detected

Latest commit: d3e5bd9

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@moonshot-ai/kimi-code	Patch

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Keep a dismissed provider dialog closed

If a refresh takes long enough for the user to press Esc, the existing manager restores the editor, but the refresh continues and this unconditional finally mounts a new manager when it completes. This unexpectedly steals focus from the editor or any dialog opened in the meantime and makes Esc appear ineffective; reopen only if the original manager is still active, or disable/cancel dismissal while refreshing.

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