Add sticky positioning to right sidebar for persistent navigation access

[Copilot]

Right sidebars on section pages now use sticky positioning to remain visible while scrolling through long content, improving navigation accessibility and user engagement.

Changes

• Modified SectionLayout.tsx sidebar container to add lg:sticky lg:top-6 lg:self-start lg:z-20
  • Sticky positioning only on lg: breakpoint (≥1024px) where sidebar is visible
  • top-6 spacing prevents header overlap
  • z-20 maintains proper stacking order below header (z-50) and left sidebar (z-30)

// Before
<div className={sectionClasses.sidebar}>{sidebar}</div>

// After
<div className={`${sectionClasses.sidebar} lg:sticky lg:top-6 lg:self-start lg:z-20`}>{sidebar}</div>

Impact

Affects all section pages using SectionLayout component: JavaScript, TypeScript, Python, React, Next.js, Data Structures, Big-O, System Design, RxJS, and Git.

Screenshots

Before scrolling:

After scrolling - sidebar remains accessible:

Data Structures page example:

React page example:

Original prompt

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This section details on the original issue you should resolve

<issue_title>On the Pages where we have the right sidebar and the page is long it also should scroll along the content.</issue_title>
<issue_description>We have some pages that are having a sidebar to the right. It should be sticky when we are scrolling to the long content and give a user better experience to engage and clicking to any other pages.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes On the Pages where we have the right sidebar and the page is long it also should scroll along the content. #5

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[mnaimfaizy]

@copilot LGTM 😄