Fix path traversal, encoding, and edge case bugs

pixstrip-core/src/operations/rename.rs

@@ -31,6 +31,7 @@ pub fn apply_template_full(
         if let Some(end) = result[start..].find('}') {
             let spec = &result[start + 9..start + end];
             if let Ok(padding) = spec.parse::<usize>() {
+                let padding = padding.min(10);
                 let counter_str = format!("{:0>width$}", counter, width = padding);
                 result = format!("{}{}{}", &result[..start], counter_str, &result[start + end + 1..]);
             }