[Docs] fix(ui): resolve TOC scrollbar overlap and top clipping

[akshatsinghai6682-sketch]

Notes for Reviewers

This PR fixes #1172

• Added scrollbar-gutter: stable; and a 8px right margin to .td-sidebar-toc to prevent its custom scrollbar from overlapping the browser's native scrollbar.
• Added track margin offsets (margin-top: 0.5rem; margin-bottom: 0.5rem;) to both .td-sidebar and .td-sidebar-toc scrollbars so their top corners/tips are not clipped under the sticky header.
• Ensured consistent 6px width, cyan $primary thumb color, and rounded corners across both left and right sidebars.

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Summary by CodeRabbit

• Style
  • Improved right sidebar table-of-contents scrolling and sticky positioning.
  • Added reserved scrollbar space and refined spacing for better layout consistency.
  • Updated scrollbar appearance, including a highlighted thumb on hover.

[coderabbitai]

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 7332ed9f-2698-4504-b725-ad7276e91352

📥 Commits

Reviewing files that changed from the base of the PR and between 6d0cc72 and a63013b.

📒 Files selected for processing (1)

• assets/scss/_styles_project.scss

📝 Walkthrough

Walkthrough

The TOC sidebar now applies sticky scrolling without an @supports gate. It reserves scrollbar space, adds right spacing, increases right padding, and customizes the WebKit scrollbar track and thumb.

Changes

TOC sidebar styling

Layer / File(s)	Summary
Sidebar scrolling and scrollbar styling assets/scss/_styles_project.scss	The TOC sidebar now applies sticky positioning and scrolling directly. It reserves scrollbar space, adds an 8px right margin, increases right padding, and adds WebKit scrollbar styling with a hover state. Blank-line placement was also adjusted.

Estimated code review effort: 2 (Simple) | ~10 minutes

Suggested reviewers: miacycle, parth-tussle, sbragul26

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the documentation UI fix for TOC scrollbar overlap and top clipping.
Linked Issues check	✅ Passed	The changes address issue #1172 by spacing the TOC scrollbar from the native scrollbar and preventing visual overlap.
Out of Scope Changes check	✅ Passed	The scrollbar spacing, positioning, and styling changes directly support the linked issue and stated PR objectives.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@assets/scss/_styles_project.scss`:
- Around line 314-315: Remove the blank line immediately before the position
declaration in the affected style rule, keeping padding-right and position as
consecutive declarations.
- Around line 325-341: Extend the scrollbar styling beside the existing
`.td-sidebar-toc` rules to also target `.td-sidebar`, including scrollbar width,
transparent track with the same top and bottom margins, primary thumb color,
rounded corners, and hover color. Keep TOC-specific `scrollbar-gutter` and
`margin-right` declarations scoped only to `.td-sidebar-toc`.

🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 76f5a754-cd7b-4f55-a912-028f70a85414

📥 Commits

Reviewing files that changed from the base of the PR and between 460b25e and 6d0cc72.

📒 Files selected for processing (1)

• assets/scss/_styles_project.scss