Unquoted album tracks: the name starts at the track number

"A Strange Light from the East - Eastern Influenced Western Music
(1965-72) - CD2 - 07 - Rascals - Sattva.mp3 (1/43)": unquotedName cut at
the last " - " ("Sattva.mp3"), leaving track number and artist in the
subject, so every track was a release (85665085, 85665050). With a
" - NN - " track or part number the name starts there ("07 - Rascals -
Sattva.mp3"), the rest names the album and disc. Both implementations;
tests; fixtures identical.

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

edge/src/indexer.rs

@@ -259,6 +259,20 @@ fn has_extension(s: &str) -> bool {
     s[..dot].chars().last().is_some_and(|c| c != '.' && !js::is_space(c))
 }
 
+/// The first / - \d{1,3} - / in `text`: the index of its " - ".
+fn first_track(text: &str) -> Option<usize> {
+    let b = text.as_bytes();
+    let mut from = 0;
+    while let Some(i) = text[from..].find(" - ").map(|i| i + from) {
+        let digits = b[i + 3..].iter().take_while(|c| c.is_ascii_digit()).count();
+        if (1..=3).contains(&digits) && b[i + 3 + digits..].starts_with(b" - ") {
+            return Some(i);
+        }
+        from = i + 1;
+    }
+    None
+}
+
 /// unquotedName (lib/headers/subject.ts): the file name of a subject without a quoted one, from the text before its counter.
 pub fn unquoted_name(before_counter: &str) -> Option<String> {
     let mut text = before_counter.trim_end_matches(js::is_space);
@@ -300,7 +314,8 @@ pub fn unquoted_name(before_counter: &str) -> Option<String> {
     }
     if has_extension(text) {
         let bracket = text.rfind("] ").map_or(0, |i| i + 2);
-        let dash = text.rfind(" - ").map_or(0, |i| i + 3);
+        // A track or part number (/ - \d{1,3} - /): the name starts there; else after the last " - ".
+        let dash = first_track(text).or_else(|| text.rfind(" - ")).map_or(0, |i| i + 3);
         let name = js::trim(&text[bracket.max(dash)..]);
         return (!name.is_empty() && has_extension(name)).then(|| name.to_string());
     }
@@ -870,6 +885,7 @@ mod unquoted_tests {
             ("New_Super_Mario_Bros._[Keygen].exe ", Some("New_Super_Mario_Bros._[Keygen].exe")),
             ("Emily_18_-_Bed.part01.rar Emily 18 bed video FULL NUDE ", Some("Emily_18_-_Bed.part01.rar")),
             ("[33/117] 674a37548b09.dat ", Some("674a37548b09.dat")),
+            ("A Strange Light from the East - Eastern Influenced Western Music (1965-72) - CD2 - 07 - Rascals - Sattva.mp3 ", Some("07 - Rascals - Sattva.mp3")),
             ("pal!    [Mivina high(1).wmv\" yEnc] ", Some("Mivina high(1).wmv")),
             ("[03/21 Geroellheimer - S03E16.part01.rar\" yEnc ", Some("Geroellheimer - S03E16.part01.rar")),
             ("[7w] - 9BbEV2MrTi59GBTEFlVrssBrXNwXf2SK9cQEeDjg yEnc ", None),