fix(button): add dark:hover styles to outline variant

[Hamed-Ajaj]

Fix outline button hover in dark mode

The outline button variant defines a dark:bg-* background but does not include a corresponding dark:hover:* style.

Because .dark .button has higher specificity than .button:hover, the dark background overrides the hover background, making hover styles appear broken in dark mode while still working correctly in light mode.

What this PR does

• Adds dark:hover:bg-* to the outline button variant
• Restores visible hover feedback in dark mode
• Keeps existing light mode behavior unchanged

Reproduction

1. Enable dark mode
2. Use the outline button variant
3. Hover shows no visual feedback

After this change, hover works consistently in both light and dark modes.

Fixes #9175

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