address issues

Signed-off-by: chang-ning <spiderpower02@gmail.com>

Author: crazyguitar

src/tui/ui.rs

@@ -287,6 +287,7 @@ fn pct_gauge_text(pct: Option<u32>, bar_w: usize) -> String {
 /// `avail >= sum(mins) + gaps`; below that all columns sit at their min
 /// and ratatui clips. See the shave pass for how floor overshoot is paid.
 fn scaled_col_widths(natural: &[u16], mins: &[u16], avail: u16) -> Vec<u16> {
+    debug_assert_eq!(natural.len(), mins.len());
     if natural.is_empty() {
         return Vec::new();
     }
@@ -296,10 +297,15 @@ fn scaled_col_widths(natural: &[u16], mins: &[u16], avail: u16) -> Vec<u16> {
     if avail >= total - 1 {
         return natural.to_vec();
     }
+    // Rounded division avoids a systematic downward bias; any overshoot
+    // is paid back by the shave pass below.
     let mut out: Vec<u16> = natural
         .iter()
         .zip(mins)
-        .map(|(&nat, &min)| (((nat as u32 * avail as u32) / total as u32) as u16).max(min))
+        .map(|(&nat, &min)| {
+            let scaled = (nat as u32 * avail as u32 + total as u32 / 2) / total as u32;
+            (scaled as u16).max(min)
+        })
         .collect();
     // Reclaim min-floor overshoot from columns still above their floor,
     // largest excess first, so the result fits whenever sum(mins) does.