CSS syntax highlighting shows warnings on valid CSS

Parent Issue

No response

Problem Statement

Looks like Monaco code editor running in dotCMS is version 0.33. This version is quite out of date now, and doesn't have good highlighting support for things like css nesting, :has selector, etc that are baseline.

Steps to Reproduce

1. Open a css file through the dotCMS UI
2. Type or paste in CSS that includes these features
3. Observe red squiggles and a warning on mouseover

Some example CSS that shows errors:

.foo {
  .bar {
    display: none;
  }
}

.foo:has(> .bar) {
  display: block;
}

Acceptance Criteria

Update Monaco to a more recent version

dotCMS Version

24.12.05

Proposed Objective

Code Maintenance

Proposed Priority

Priority 3 - Average

External Links... Slack Conversations, Support Tickets, Figma Designs, etc.

No response

Assumptions & Initiation Needs

No response

Quality Assurance Notes & Workarounds

No response

Sub-Tasks & Estimates

No response

Start in the dotCMS UI code that configures the Monaco editor and check where version 0.33 is pinned. Reproduce the nested CSS and :has examples there; done means the updated editor no longer shows red squiggles or warnings for this valid CSS.