Image sets: a suffix that ends the number before is a repeat too

"051 - White leather kate054001_1_1.jpg": the index is inside 054001
(set 054, image 001) and _1_1 repeats it, but only a suffix equal to the
whole number before counted as a repeat, so the set kept 054001 and every
image was a release (Duke's threads: 2,791 releases of 3,251 files). A
suffix that the number before ends with is a repeat as well. Both
implementations; tests; fixtures identical.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

edge/src/names.rs

@@ -430,7 +430,8 @@ pub fn image_set(stem: &str) -> String {
         let Some(last) = before.iter().rposition(u8::is_ascii_digit) else { break };
         let start = before[..=last].iter().rposition(|c| !c.is_ascii_digit()).map_or(0, |i| i + 1);
         let previous = &before[start..=last];
-        let same = trim_zeros(n) == trim_zeros(previous);
+        // A repeat: the same number, or the end of the one before (054001 ends in 1).
+        let same = trim_zeros(n) == trim_zeros(previous) || previous.ends_with(n);
         let year = n.len() == 4 && (n.starts_with(b"19") || n.starts_with(b"20"));
         if same || year || n.len() >= 4 {
             let cut = before.len();
@@ -1173,6 +1174,7 @@ mod image_set_tests {
             ("keira_s04_l keira_s04_0040_l", "keira_s04_l keira_s04_"),
             ("IMG_2676", "IMG_"),
             ("2877-041", "2877-"),
+            ("051 - White leather kate054001_1_1", "051 - White leather kate"),
             ("JimAndJoey Kindly Husband-to-Be", ""),
         ] {
             assert_eq!(image_set(stem), want, "{stem}");