feat: change size formatting to k8s style (e.g. 3Gi, 4Ti)

Co-authored-by: aider (openai/andrew/openrouter/anthropic/claude-sonnet-4) <aider@aider.chat>

src/modes/common.rs

@@ -30,8 +30,28 @@ pub fn get_meta_from_env() -> HashMap<String, String> {
 }
 
 pub fn format_size_human_readable(size: u64) -> String {
-    let options = FormatSizeOptions::from(BINARY).decimal_places(1);
-    humansize::format_size(size, options)
+    const UNITS: &[&str] = &["", "Ki", "Mi", "Gi", "Ti", "Pi", "Ei"];
+    const THRESHOLD: u64 = 1024;
+    
+    if size == 0 {
+        return "0".to_string();
+    }
+    
+    let mut size_f = size as f64;
+    let mut unit_index = 0;
+    
+    while size_f >= THRESHOLD as f64 && unit_index < UNITS.len() - 1 {
+        size_f /= THRESHOLD as f64;
+        unit_index += 1;
+    }
+    
+    if unit_index == 0 {
+        format!("{}", size)
+    } else if size_f.fract() == 0.0 {
+        format!("{}{}", size_f as u64, UNITS[unit_index])
+    } else {
+        format!("{:.1}{}", size_f, UNITS[unit_index])
+    }
 }
 
 pub fn format_size(size: u64, human_readable: bool) -> String {