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fix(test): replace toHaveStyle with class comparison in MonthCalendar tests

The jsdom dependency bump (30.1.2 → 30.1.3, commit 8a54d23) caused two
MonthCalendar tests to fail because they used toHaveStyle() to check computed
background styles.

Root cause: Chakra UI v3 applies background colors via CSS classes with CSS
custom properties that jsdom cannot resolve — getComputedStyle() returns
rgba(0, 0, 0, 0) (transparent) instead of the expected var(--chakra-colors-gray-100).

Fix: Replace toHaveStyle() assertions with CSS class comparison. When
showBackgroundColorForWeekend is enabled, the weekend cell gets a different
CSS class than the weekday cell (due to Chakra's background prop). When
disabled, both cells share the same classes.

Co-authored-by: Junie <junie@jetbrains.com>

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