CMMS embedding: follow the CMMS light/dark theme

window.CMMS_SCAD_CONFIG.dark (set by edit.php from theme_is_dark()) now
drives: the primereact theme (runtime <link> to a bundled
primereact-theme-{light,dark}.css instead of a static light import), the
Monaco editor theme (vs-dark / light), and a body.cmms-dark class that
overrides the light-hardcoded bits in public/index.html. Standalone use
is unchanged (light).

public/index.html

@@ -118,6 +118,15 @@
       }
 
       .github-fork-ribbon:before { background-color: #333; }
+
+      /* CMMS embedding hook (patch): when loaded dark inside the CMMS, the
+         body gets .cmms-dark (src/index.tsx). Override the light-hardcoded
+         bits above; the primereact theme and Monaco theme are switched
+         separately. */
+      body.cmms-dark { background-color: #1e1e1e; color: #e6e6e6; }
+      body.cmms-dark .p-fieldset-legend { background-color: rgba(0,0,0,0.4) !important; }
+      body.cmms-dark .monaco-editor,
+      body.cmms-dark .openscad-editor { background-color: rgba(30,30,30,0.5) !important; }
     </style>
   </head>
   <body>