fix(slash menu): make it follow active item when navigating with arrows

[yzuyr]

Oi @cameronapak. Fixing slash menu active item visibility when navigating with arrows.

Summary by CodeRabbit

• Bug Fixes
  • Improved slash menu navigation by automatically scrolling the active option into view.
  • Ensures the selected option remains visible while moving through the menu.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: ec512523-c67a-41da-ab6a-4e477c7c1da7

📥 Commits

Reviewing files that changed from the base of the PR and between 7c9cfd1 and ce3a97d.

📒 Files selected for processing (1)

• src/components/slash-menu-list.tsx

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📝 Walkthrough

Walkthrough

SlashMenuList now tracks its scrollable container and automatically scrolls the element marked aria-selected="true" into view whenever activeIndex changes.

Changes

Slash menu scrolling

Layer / File(s)	Summary
Active option visibility src/components/slash-menu-list.tsx	Adds React refs and an activeIndex effect that finds the selected option and calls scrollIntoView({ block: "nearest" }) on the attached scroll container.

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

Suggested reviewers: cameronapak

🚥 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 matches the main change: keeping the slash menu aligned with the active item during arrow-key navigation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[yzuyr]

Nevermind, I see there's #98 existing already. Feel free to close it 😅