refactor: the server says a count one way, words.Count, for notifications, a wanted match's reason and the duplicate resolver's activity line (M505 #5643)

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

internal/notifications/render.go

@@ -3,6 +3,8 @@ package notifications
 import (
 	"encoding/json"
 	"fmt"
+
+	"git.fabledsword.com/bvandeusen/minstrel/internal/words"
 )
 
 // Rendered is a notification as people read it. The server renders it once,
@@ -138,13 +140,10 @@ func Render(kind Kind, payload []byte) Rendered {
 }
 
 func plural(n int64, one, many string) string {
-	if n == 1 {
-		return "1 " + one
-	}
 	if n < 1 {
 		// A coalesced kind always carries a count; this only guards a
 		// malformed row from reading "0 tracks went missing".
 		return "Some " + many
 	}
-	return fmt.Sprintf("%d %s", n, many)
+	return words.Count(n, one, many)
 }