chore: consolidate platform split checks

webui/src/styles/tokens.css

@@ -20,6 +20,11 @@
   --text-strong: #303135;
   --muted: #8a8781;
   --muted-text: var(--muted);
+  --control-disabled-bg: #ebe8e2;
+  --control-disabled-border: #c2bcb3;
+  --control-disabled-text: #706b63;
+  --control-disabled-placeholder: #969087;
+  --control-disabled-label: #7d776f;
 
   --green: #7bbcaf;
   --amber: #f5c56c;
@@ -45,6 +50,42 @@
   --font: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
 }
 
+:root[data-theme="dark"] {
+  --rail-bg: #171819;
+  --rail-bg-active: #0f1011;
+  --bg: #202120;
+  --bar: #34342f;
+  --panel: #2b2c2a;
+  --panel-soft: #242523;
+  --panel-header: #30312e;
+  --surface: #262724;
+  --surface-subtle: #2e302c;
+  --line: #454740;
+  --line-dark: #5b5d54;
+  --border: var(--line);
+  --text: #dfddd7;
+  --text-strong: #f6f4ed;
+  --muted: #aaa79d;
+  --muted-text: var(--muted);
+  --control-disabled-bg: #33352f;
+  --control-disabled-border: #5f6058;
+  --control-disabled-text: #b8b4aa;
+  --control-disabled-placeholder: #918d83;
+  --control-disabled-label: #aaa69b;
+  --shadow: 0 1px 2px rgba(0,0,0,.35), 0 10px 30px rgba(0,0,0,.18);
+  --shadow-menu: 0 18px 44px rgba(0,0,0,.42);
+  --shadow-popover: 0 8px 22px rgba(0,0,0,.36);
+}
+
+.ui-reduce-motion *,
+.ui-reduce-motion *::before,
+.ui-reduce-motion *::after {
+  animation-duration: .001ms !important;
+  animation-iteration-count: 1 !important;
+  scroll-behavior: auto !important;
+  transition-duration: .001ms !important;
+}
+
 * { box-sizing: border-box; }
 html, body, #root { height: 100%; }
 body { margin: 0; overflow: hidden; font-family: var(--font); color: var(--text); background: var(--bg); }