fix: address code review findings

internal/normalize/normalize.go

@@ -37,8 +37,13 @@ func NormalizeString(s string) string {
 	// Remove parenthesized content (e.g., (Deluxe), (Remastered))
 	s = parenRe.ReplaceAllString(s, "")
 
-	// Remove years (4-digit numbers between 1000-2999)
-	s = yearRe.ReplaceAllString(s, "")
+	// Remove years (4-digit numbers between 1000-2999). If stripping the
+	// year would empty the entire string (e.g. an album literally titled
+	// "1989" or "2112"), keep the original form so the title can still match.
+	stripped := yearRe.ReplaceAllString(s, "")
+	if strings.TrimSpace(stripped) != "" {
+		s = stripped
+	}
 
 	// Replace common separators with spaces before stripping other special chars
 	s = strings.ReplaceAll(s, "-", " ")

internal/normalize/normalize_test.go

@@ -36,6 +36,9 @@ func TestNormalizeString_Basic(t *testing.T) {
 		// Digits that are not years should stay
 		{"30 Seconds to Mars", "30 seconds to mars"},
 		{"1941 - The Greatest Hits", "the greatest hits"},
+		// Year-only title is preserved (not collapsed to empty) so it can still match
+		{"1989", "1989"},
+		{"2112", "2112"},
 	}
 
 	for _, tt := range tests {