/**
 * Copy text to the clipboard, reporting whether it actually happened.
 *
 * `navigator.clipboard` is undefined outside a secure context (plain http on a
 * LAN address — how an on-farm tablet often reaches an internal host), and
 * `writeText` can also reject when the document is not focused or permission is
 * denied. Fire-and-forgetting it means the UI claims "Copied" while the
 * clipboard still holds whatever was there before, which is worse than no
 * feedback: the user pastes stale content and does not know why.
 */
export declare function copyToClipboard(text: string): Promise<boolean>;
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