fix: address code review findings

internal/normalize/normalize.go

@@ -16,13 +16,13 @@ import (
 var (
 	bracketRe = regexp.MustCompile(`\[[^\]]*\]`)
 	parenRe   = regexp.MustCompile(`\([^)]*\)`)
-	yearRe    = regexp.MustCompile(`\b(1[0-9]{3}|2[0-9]{3})\b`)
+	yearRe    = regexp.MustCompile(`\b[0-9]{4}\b`)
 	spaceRe   = regexp.MustCompile(`\s+`)
 	// bareYearRe matches a title that is *only* a single year (with optional
 	// surrounding whitespace), e.g. "1989" or "2112". Used to decide whether a
 	// title that collapses entirely to a year should keep it (so it matches
 	// itself) or be treated as a distinct reissue that must collapse to empty.
-	bareYearRe = regexp.MustCompile(`^\s*(1[0-9]{3}|2[0-9]{3})\s*$`)
+	bareYearRe = regexp.MustCompile(`^\s*[0-9]{4}\s*$`)
 )
 
 // NormalizeString normalizes a string for fuzzy matching by:
@@ -46,7 +46,7 @@ func NormalizeString(s string) string {
 	// Remove parenthesized content (e.g., (Deluxe), (Remastered))
 	s = parenRe.ReplaceAllString(s, "")
 
-	// Remove years (4-digit numbers between 1000-2999). If stripping the year
+	// Remove years (any 4-digit number). If stripping the year
 	// empties the entire string, decide what to keep:
 	//   - A bare year title (e.g. "1989", "2112") has no other words, so keep
 	//     the year so it can still match itself (the user owns that album).