Function ballot_bar 

pub fn ballot_bar(total: u64, successes: u64, errors: u64) -> String

Per-cell completion bar — variant of braille_bar used when the phase’s total extent is small enough that each cell can represent ONE operation rather than a percentage slice. Renders ballot-box glyphs:

• ☒ (U+2612) — completed with an error
• ☑ (U+2611) — completed successfully
• ☐ (U+2610) — pending (not yet completed)

Cells are grouped in errors → successes → pending order so a glance reads worst-news-first; with zero errors the bar degenerates cleanly to the conventional ☑☑☑…☐☐☐… shape.

total is the cell count (= number of operations, capped at 10 to match the visual width of the braille variant). successes and errors are clamped to total so a brief over-count race during refresh doesn’t render a malformed bar.