Add demo mode to cycle all themes

contest-styles.json

@@ -266,27 +266,41 @@
         "frame": 24
       },
       "preview": "[date time user] @host - /path"
+    },
+      {
+        "id": "hawolexv2",
+        "name": "HawolexV2",
+        "tagline": "Winter neon gradient",
+        "description": "Multi-segment winter neon gradient with stronger separation.",
+        "layout": {
+          "line1": "date time user | @host | /path",
+          "line2": "status arrow + emoji"
+        },
+        "colors": {
+          "zone1_bg": 54,
+          "zone2_bg": 55,
+          "zone3_bg": 56,
+          "zone4_bg": 31,
+          "zone5_bg": 30,
+          "zone_fg": 255,
+          "path_fg": 230,
+          "frame": 24
+        },
+        "preview": "[date time user] @host - /path"
     },
     {
-      "id": "hawolexv2",
-      "name": "HawolexV2",
-      "tagline": "Winter neon gradient",
-      "description": "Multi-segment winter neon gradient with stronger separation.",
+      "id": "demo",
+      "name": "Demo",
+      "tagline": "Auto-rotate all themes",
+      "description": "Cycles through all themes each prompt for rapid screenshots.",
       "layout": {
-        "line1": "date time user | @host | /path",
-        "line2": "status arrow + emoji"
+        "line1": "auto",
+        "line2": "auto"
       },
       "colors": {
-        "zone1_bg": 54,
-        "zone2_bg": 55,
-        "zone3_bg": 56,
-        "zone4_bg": 31,
-        "zone5_bg": 30,
-        "zone_fg": 255,
-        "path_fg": 230,
-        "frame": 24
+        "note": "Uses each theme's native palette"
       },
-      "preview": "[date time user] @host - /path"
+      "preview": "(auto-rotate)"
     },
     {
       "id": "radar",