Bug 1946764 - Support non-boolean media query prefs via -moz-pref(). r=firefox-style-system-reviewers,desktop-theme-reviewers,settings-reviewers,tabbrowser-reviewers,places-reviewers,sidebar-reviewers,urlbar-reviewers,firefox-ai-ml-reviewers,dao,mconley,dshin,mak

Allow querying int and string prefs too via functional syntax:

```
@media -moz-pref("pref-name", <value>) {
```

No argument means the pref exists and has a non-zero/false/empty value.
Unfortunately stylelint is still unhappy with this so we need to keep
the annoying comments...

Differential Revision: https://phabricator.services.mozilla.com/D237275

browser/components/genai/chat.css

@@ -66,7 +66,7 @@ body {
   z-index: 1;
 
   /* stylelint-disable-next-line media-query-no-invalid */
-  @media not (-moz-bool-pref: "sidebar.revamp") {
+  @media not -moz-pref("sidebar.revamp") {
     display: none;
   }
 }