feat(console): left-align task IDs

This looks somewhat nicer, IMO --- and, `top` and `htop` do this. It
would be nice to also left-align other numeric values (a la
`top`/`htop`), but we can't do that for `Duration`s currently, as the
`fmt::Debug` impl for `std::time::Duration` simply ignores alignment
specifiers (see rust-lang/rust#88059).

We could write our own custom formatter for durations, I guess...

console/src/view/tasks.rs

@@ -110,7 +110,11 @@ impl List {
                 let task = task.borrow();
                 let is_terminated = task.completed_for() > 0;
                 let mut row = Row::new(vec![
-                    Cell::from(id_width.update_str(task.id().to_string())),
+                    Cell::from(id_width.update_str(format!(
+                        "{:>width$}",
+                        task.id(),
+                        width = id_width.chars() as usize
+                    ))),
                     Cell::from(task.state().render(styles)),
                     dur_cell(task.total(now)),
                     dur_cell(task.busy(now)),