Function translate_pixel_to_cell 

pub fn translate_pixel_to_cell(
    px_x: f64,
    px_y: f64,
    cell_w: u32,
    cell_h: u32,
) -> Pos

Converts physical pixel coordinates to a grid cell Pos, given a raw cell_w/cell_h pixel size.

Clamps to u16::MAX so out-of-bounds cursor positions (negative or extremely large) don’t panic: the game loop is responsible for bounds-checking against the terminal size.

run.rs’s own cursor/mouse handlers call CellGeometry::pixel_to_cell via Presenter::geometry directly rather than this function, since they have a full Presenter (and so a CellGeometry) available. This is kept as a separate public function for callers that only have a raw cell_w/cell_h pixel size on hand, not a CellGeometry; both share the same private clamp/divide helper so the two can’t drift apart (see retroglyph#821).