Implementasikan createThemeFactory(theme) yang return factory dengan method createButton(label) dan createInput(placeholder).

Untuk theme "light":

• createButton(label) → { kind: "button", label, bg: "#fff", color: "#000" }
• createInput(placeholder) → { kind: "input", placeholder, bg: "#fff", border: "#ccc" }

Untuk theme "dark":

• createButton(label) → { kind: "button", label, bg: "#000", color: "#fff" }
• createInput(placeholder) → { kind: "input", placeholder, bg: "#111", border: "#444" }

Theme lain → throw Error("Unknown theme").

Hint

• Abstract factory: factory yang return factory lain. createThemeFactory(theme) return { createButton, createInput } sesuai theme.
• Theme "light": button bg #fff color #000, input placeholder styled cerah. Theme "dark": #111/#444. Struktur sama, detail beda.
• Theme tak dikenal → return object yang throw atau method yang throw/return "Unknown theme". Konsisten dengan test case.