Function populate_people 

pub fn populate_people<F>(
    parts: &ExploreViewParts,
    ctx: Arc<AppContext>,
    people: Vec<Person>,
    on_click: F,
)
where
    F: Fn(String, String) + 'static,

Populate the round avatar buttons for recognized people in the dashboard section.

Stores the full fetched list so face-visibility toggles can re-filter without re-querying the server. Always call with include_hidden=true upstream so the Show hidden toggle can apply locally.