Make web UI dark mode only, drop prefers-color-scheme light theme

web/templates/base.html

@@ -5,33 +5,20 @@
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <title>Paperwall</title>
   <style>
+    /* Dark mode only, no light theme -- doesn't follow prefers-color-scheme. */
     :root {
-      --bg: #f6f6f4;
-      --surface: #ffffff;
-      --border: #e3e3e0;
-      --text: #1a1a1a;
-      --text-muted: #6b6b68;
-      --accent: #1a1a1a;
-      --accent-contrast: #ffffff;
-      --success: #1a7a3d;
-      --danger: #b3261e;
+      --bg: #121212;
+      --surface: #1c1c1c;
+      --border: #2f2f2f;
+      --text: #f2f2f0;
+      --text-muted: #9a9a97;
+      --accent: #f2f2f0;
+      --accent-contrast: #121212;
+      --success: #3fb26f;
+      --danger: #e4685a;
       --radius: 12px;
-      --shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 6px 16px rgba(0, 0, 0, 0.05);
-    }
-
-    @media (prefers-color-scheme: dark) {
-      :root {
-        --bg: #121212;
-        --surface: #1c1c1c;
-        --border: #2f2f2f;
-        --text: #f2f2f0;
-        --text-muted: #9a9a97;
-        --accent: #f2f2f0;
-        --accent-contrast: #121212;
-        --success: #3fb26f;
-        --danger: #e4685a;
-        --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 6px 20px rgba(0, 0, 0, 0.35);
-      }
+      --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 6px 20px rgba(0, 0, 0, 0.35);
+      color-scheme: dark;
     }
 
     * { box-sizing: border-box; }