Function filtered_recent_indices 

pub fn filtered_recent_indices(app: &AppState) -> Vec<usize>

What: Produce visible indices into app.recent considering pane-find when applicable.

Inputs:

• app: Application state (focus, pane_find, recent list)

Output:

• Vector of indices in ascending order without modifying application state.

Panics

• Panics if pane_find is Some but becomes None between the check and the expect call (should not happen in single-threaded usage)

Details:

• Applies pane find filtering only when the Recent pane is focused and the finder string is non-empty; otherwise returns the full range.