Add scrollbar-width and scrollbar-color utilities

Adds new utilities for the `scrollbar-width` and `scrollbar-color` CSS
properties:

- `scrollbar-auto`, `scrollbar-thin`, `scrollbar-none` for `scrollbar-width`
- `scrollbar-thumb-*` and `scrollbar-track-*` color utilities, which
  compose via the `--tw-scrollbar-thumb` / `--tw-scrollbar-track` CSS
  variables so the thumb and track colors can be set independently while
  emitting a single `scrollbar-color` declaration.

Author: claude

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 - _Experimental_: add `@container-size` utility ([#18901](https://github.com/tailwindlabs/tailwindcss/pull/18901))
+- Add `scrollbar-{auto,thin,none}` utilities for `scrollbar-width`, and `scrollbar-thumb-*` / `scrollbar-track-*` color utilities for `scrollbar-color`
 
 ### Fixed
 

packages/tailwindcss/src/__snapshots__/intellisense.test.ts.snap

@@ -11013,6 +11013,141 @@ exports[`getClassList 1`] = `
   "scroll-py-96",
   "scroll-py-px",
   "scroll-smooth",
+  "scrollbar-auto",
+  "scrollbar-none",
+  "scrollbar-thin",
+  "scrollbar-thumb-current",
+  "scrollbar-thumb-current/0",
+  "scrollbar-thumb-current/5",
+  "scrollbar-thumb-current/10",
+  "scrollbar-thumb-current/15",
+  "scrollbar-thumb-current/20",
+  "scrollbar-thumb-current/25",
+  "scrollbar-thumb-current/30",
+  "scrollbar-thumb-current/35",
+  "scrollbar-thumb-current/40",
+  "scrollbar-thumb-current/45",
+  "scrollbar-thumb-current/50",
+  "scrollbar-thumb-current/55",
+  "scrollbar-thumb-current/60",
+  "scrollbar-thumb-current/65",
+  "scrollbar-thumb-current/70",
+  "scrollbar-thumb-current/75",
+  "scrollbar-thumb-current/80",
+  "scrollbar-thumb-current/85",
+  "scrollbar-thumb-current/90",
+  "scrollbar-thumb-current/95",
+  "scrollbar-thumb-current/100",
+  "scrollbar-thumb-inherit",
+  "scrollbar-thumb-inherit/0",
+  "scrollbar-thumb-inherit/5",
+  "scrollbar-thumb-inherit/10",
+  "scrollbar-thumb-inherit/15",
+  "scrollbar-thumb-inherit/20",
+  "scrollbar-thumb-inherit/25",
+  "scrollbar-thumb-inherit/30",
+  "scrollbar-thumb-inherit/35",
+  "scrollbar-thumb-inherit/40",
+  "scrollbar-thumb-inherit/45",
+  "scrollbar-thumb-inherit/50",
+  "scrollbar-thumb-inherit/55",
+  "scrollbar-thumb-inherit/60",
+  "scrollbar-thumb-inherit/65",
+  "scrollbar-thumb-inherit/70",
+  "scrollbar-thumb-inherit/75",
+  "scrollbar-thumb-inherit/80",
+  "scrollbar-thumb-inherit/85",
+  "scrollbar-thumb-inherit/90",
+  "scrollbar-thumb-inherit/95",
+  "scrollbar-thumb-inherit/100",
+  "scrollbar-thumb-transparent",
+  "scrollbar-thumb-transparent/0",
+  "scrollbar-thumb-transparent/5",
+  "scrollbar-thumb-transparent/10",
+  "scrollbar-thumb-transparent/15",
+  "scrollbar-thumb-transparent/20",
+  "scrollbar-thumb-transparent/25",
+  "scrollbar-thumb-transparent/30",
+  "scrollbar-thumb-transparent/35",
+  "scrollbar-thumb-transparent/40",
+  "scrollbar-thumb-transparent/45",
+  "scrollbar-thumb-transparent/50",
+  "scrollbar-thumb-transparent/55",
+  "scrollbar-thumb-transparent/60",
+  "scrollbar-thumb-transparent/65",
+  "scrollbar-thumb-transparent/70",
+  "scrollbar-thumb-transparent/75",
+  "scrollbar-thumb-transparent/80",
+  "scrollbar-thumb-transparent/85",
+  "scrollbar-thumb-transparent/90",
+  "scrollbar-thumb-transparent/95",
+  "scrollbar-thumb-transparent/100",
+  "scrollbar-track-current",
+  "scrollbar-track-current/0",
+  "scrollbar-track-current/5",
+  "scrollbar-track-current/10",
+  "scrollbar-track-current/15",
+  "scrollbar-track-current/20",
+  "scrollbar-track-current/25",
+  "scrollbar-track-current/30",
+  "scrollbar-track-current/35",
+  "scrollbar-track-current/40",
+  "scrollbar-track-current/45",
+  "scrollbar-track-current/50",
+  "scrollbar-track-current/55",
+  "scrollbar-track-current/60",
+  "scrollbar-track-current/65",
+  "scrollbar-track-current/70",
+  "scrollbar-track-current/75",
+  "scrollbar-track-current/80",
+  "scrollbar-track-current/85",
+  "scrollbar-track-current/90",
+  "scrollbar-track-current/95",
+  "scrollbar-track-current/100",
+  "scrollbar-track-inherit",
+  "scrollbar-track-inherit/0",
+  "scrollbar-track-inherit/5",
+  "scrollbar-track-inherit/10",
+  "scrollbar-track-inherit/15",
+  "scrollbar-track-inherit/20",
+  "scrollbar-track-inherit/25",
+  "scrollbar-track-inherit/30",
+  "scrollbar-track-inherit/35",
+  "scrollbar-track-inherit/40",
+  "scrollbar-track-inherit/45",
+  "scrollbar-track-inherit/50",
+  "scrollbar-track-inherit/55",
+  "scrollbar-track-inherit/60",
+  "scrollbar-track-inherit/65",
+  "scrollbar-track-inherit/70",
+  "scrollbar-track-inherit/75",
+  "scrollbar-track-inherit/80",
+  "scrollbar-track-inherit/85",
+  "scrollbar-track-inherit/90",
+  "scrollbar-track-inherit/95",
+  "scrollbar-track-inherit/100",
+  "scrollbar-track-transparent",
+  "scrollbar-track-transparent/0",
+  "scrollbar-track-transparent/5",
+  "scrollbar-track-transparent/10",
+  "scrollbar-track-transparent/15",
+  "scrollbar-track-transparent/20",
+  "scrollbar-track-transparent/25",
+  "scrollbar-track-transparent/30",
+  "scrollbar-track-transparent/35",
+  "scrollbar-track-transparent/40",
+  "scrollbar-track-transparent/45",
+  "scrollbar-track-transparent/50",
+  "scrollbar-track-transparent/55",
+  "scrollbar-track-transparent/60",
+  "scrollbar-track-transparent/65",
+  "scrollbar-track-transparent/70",
+  "scrollbar-track-transparent/75",
+  "scrollbar-track-transparent/80",
+  "scrollbar-track-transparent/85",
+  "scrollbar-track-transparent/90",
+  "scrollbar-track-transparent/95",
+  "scrollbar-track-transparent/100",
   "select-all",
   "select-auto",
   "select-none",