Implement Horizontal & Nested Scroll Support

[bae080311]

Summary

Modern web layouts frequently incorporate horizontal scrolling elements and nested scrollable containers. The current jump-section library primarily focuses on vertical scrolling, limiting its applicability. Expanding support to include horizontal scrolling sections and sections within nested scroll areas would significantly increase its versatility.

Proposed Solution

• Extend the IntersectionObserver setup to correctly monitor and detect intersections for elements configured for horizontal scrolling.
• Introduce configuration options to specify the primary scroll direction (vertical or horizontal) for different sets of sections.
• Develop logic to correctly determine the active section within nested scroll containers, potentially requiring dynamic root element assignments for IntersectionObservers.

Acceptance Criteria

• The library can accurately identify and manage active states for sections within a horizontally scrolling container.
• Navigation controls (e.g., next/previous section buttons) function correctly for horizontal section groups.
• Active section detection works as expected for sections embedded within another scrollable element (nested scrolling).
• Clear configuration options are available to enable and configure horizontal and nested scroll behaviors.

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