fix(native-select): apply computed background color to options (#10237)

[aakarsh12x]

Fixes #10237

This PR resolves an issue where the background colors of native <option> and <optgroup> elements inside the NativeSelect component fallback (and mobile views) were not correctly applying the CSS variables and modern oklch() color utilities, specifically in dark mode on chromium-based browsers.
The Problem
Native option elements are rendered outside the CSS cascade by the OS/browser chrome. Because of this:

• They fail to resolve CSS variables (var(--input), etc.).
• Modern color functions like color-mix(in oklch...) applied via Tailwind on the parent <select> are ignored on the children elements, leaving them with the system default color (which causes bright white option backgrounds on dark-mode pages).

The Solution
Instead of relying purely on the CSS cascade for native options, we use a custom useResolvedOptionStyle hook with a React Context:

1. The hook attaches a ref to the parent <select> and reads the getComputedStyle() of the element on mount (and safely refires on theme toggles via a MutationObserver).
2. This allows the browser engine to properly resolve all variables/oklch values into a concrete rgb() format.
3. The hook passes that exact computed background and text color to a NativeSelectContext.
4. NativeSelectOption and NativeSelectOptGroup merge these securely as explicit inline style attributes—which are reliably respected across browsers regardless of the CSS cascade limitations.

Changes Made

• NativeSelect (new-york-v4): Added useResolvedOptionStyle hook + Context Provider to forward computed color values to children as inline styles.
• NativeSelect (base): Replicated fix.
• NativeSelect (radix): Replicated fix.

Testing Performed

• Verified the fix handles correctly rendering both dark-mode and light-mode dropdown background colors without causing regressions.
• Successfully dynamically recomputes if/when the document dataset theme dynamically changes.

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