Struct TabEmpty 

pub struct TabEmpty<'a> {
    pub card_title: &'a str,
    pub headline: &'a str,
    pub explainer: &'a str,
    pub hints: &'a [(&'a str, &'a str)],
}

Copy bundle for a tab’s empty state. Each tab (Containers, Tunnels, Keys, and any future Hosts/empty surface) constructs one of these and hands it to render_tab_empty, which composes the bordered card inside the existing outer block.

• card_title appears in the inner card’s top border (e.g. “Containers”).
• headline is the one-line bold statement of what is missing.
• explainer is a one or two sentence muted paragraph that names the cause (cache not yet populated, no key files, etc.). Wrap is handled internally; pass the unwrapped text.
• hints is a list of (key, action) pairs rendered as keycap rows below the explainer. Empty slice renders no hints.

Fields

card_title: &'a str

headline: &'a str

explainer: &'a str

hints: &'a [(&'a str, &'a str)]