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fix(use-toast-mutation): show error toast when successMsg is null (#2294)

The entire `toast.promise(...)` call — including the `error:` branch —
was gated on `resolvedSuccessMsg !== null`, so any configured `errorMsg`
became dead code when callers passed `successMsg: null`. This silently
swallowed mutation errors in flows that legitimately suppress the
success toast (e.g. routes that navigate away on success) but still
want user-visible error feedback.

Register `toast.promise` whenever a success message or an error message
is configured, and only emit the `success:` key when applicable. The
silent-mode escape hatch (`successMsg: null` with no `errorMsg`) is
preserved.

Fixes #2293

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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