palcarazm / bs-darkmode-toggle / 23999346988 / 1

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feat: respect system color scheme preference as initial state fallback

Implement automatic detection of user's operating system color scheme
preference using window.matchMedia('(prefers-color-scheme)') when no
saved cookie exists and allowCookie is enabled.

Priority order for initial state:
1. Cookie value (if allowCookie: true)
2. System preference (prefers-color-scheme)
3. Explicit state option
4. Default (light mode)

Added ColorModes enum for type-safe preference handling and split
applyPreferredScheme() into applyCookies() and applySystemPreference()
methods for better separation of concerns.

Implements #59

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