web: bump typescript from 5.9.3 to 6.0.2 in /web (#21107)

* Bump related TS packages.

* Fix type.

* Fix styles.

* web: bump typescript from 5.9.3 to 6.0.2 in /web

Bumps [typescript](https://github.com/microsoft/TypeScript) from 5.9.3 to 6.0.2.
- [Release notes](https://github.com/microsoft/TypeScript/releases)
- [Commits](https://github.com/microsoft/TypeScript/compare/v5.9.3...v6.0.2)

---
updated-dependencies:
- dependency-name: typescript
  dependency-version: 6.0.2
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

* Partial upgrade.

* Add dep.

* Re-add preinstall.

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: Teffen Ellis <592134+GirlBossRush@users.noreply.github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

website/docusaurus-theme/theme/DocSidebarItems/styles.css

@@ -6,13 +6,11 @@
 
     --ak-menu-item-color-hover-active: var(--ifm-color-emphasis-400);
     --ak-menu-item-border-width: 0.5px;
-    --ifm-menu-color-background-active: hsl(240 24% 98%);
 
     /* Ensures that the scrollbar color retains its visibility. */
     --ak-scrollbar-color: hsl(0deg 0% 0% / 20%);
 
     &[data-theme="dark"] {
-        --ifm-menu-color-background-active: hsl(240 20% 12%);
         --ak-menu-item-color-hover: var(--ifm-color-primary-light);
 
         --ak-scrollbar-color: hsla(0, 0%, 100%, 0.2);