fix: duc ui displays raw pointer value instead of human-readable size

[caco3]

Problem

duc ui shows raw numbers like 140729715294144 for directory sizes instead of human-readable values like 45.2G.

Root cause

In src/duc/cmd-ui.c, the format string for printing the size column was %*s (correct — siz is a char[] filled by duc_human_size()). This was inadvertently changed to %*l in commit f767128 ("fix printf number size spec", Nov 1 2024), then to %*lu in d424b7b ("fix printf number size spec for real"). Finally, commit 83a579e ("cast value", Jun 2 2025) added an explicit (size_t) cast to silence the resulting compiler warning, cementing the bug: the stack address of the siz buffer was being printed as an unsigned integer instead of the buffer's string content.

Fix

Restore the correct format specifier and drop the erroneous cast:

- printw("%*lu", max_size_len, (size_t) siz);
+ printw("%*s", max_size_len, siz);

Introduced by: f767128 — Nov 1, 2024
Made explicit by: 83a579e — Jun 2, 2025