Linear design system: new admin UI + display design switcher (8 designs)

Admin UI: Linear.app dark theme — near-black canvas, indigo-violet accent, Inter font
Display: Minimal, Minimal Color, Bold, Analog Clock, Magazine, Cards, Kiosk, Classic

admin.py

@@ -365,10 +365,30 @@ DISPLAY_THEMES = {
     },
 }
 
+# Display designs — the actual visual layout approach
+DISPLAY_DESIGNS = {
+    "classic": {
+        "label": "Classic",
+        "desc": "Original flat design, white background",
+    },
+    "magazine": {
+        "label": "Magazine",
+        "desc": "Bold typography, minimal, colored accent bars",
+    },
+    "cards": {
+        "label": "Cards",
+        "desc": "iOS-style panels with emoji icons, warm white",
+    },
+    "kiosk": {
+        "label": "Kiosk",
+        "desc": "Data-dense, dark background, inverted info cards",
+    },
+}
+
 
 @app.route("/api/display_theme", methods=["GET", "POST"])
 def api_display_theme():
-    """Theme für das Display. GET = aktuelles Theme, POST = setzen."""
+    """GET: list themes + current. POST: set theme (legacy color-only)."""
     a = require_auth()
     if a: return a
     cfg = dashboard_mod.load_config()
@@ -389,6 +409,27 @@ def api_display_theme():
     return jsonify({"ok": True, "current": theme_key, "theme": DISPLAY_THEMES[theme_key]})
 
 
+@app.route("/api/display_design", methods=["GET", "POST"])
+def api_display_design():
+    """Design für das Display (classic/magazine/cards/kiosk)."""
+    a = require_auth()
+    if a: return a
+    cfg = dashboard_mod.load_config()
+    if request.method == "GET":
+        design_key = cfg.get("display_design", "classic")
+        return jsonify({
+            "current": design_key,
+            "designs": {k: {"label": v["label"], "desc": v["desc"]} for k, v in DISPLAY_DESIGNS.items()},
+        })
+    data = request.get_json(silent=True) or {}
+    design_key = data.get("design", "classic")
+    if design_key not in DISPLAY_DESIGNS:
+        return jsonify({"ok": False, "error": "unknown design"}), 400
+    cfg["display_design"] = design_key
+    dashboard_mod.save_config(cfg)
+    return jsonify({"ok": True, "current": design_key})
+
+
 @app.route("/api/plugin_config/<plugin_name>", methods=["GET", "POST"])
 def api_plugin_config(plugin_name):
     """Plugin-spezifische Config (separat vom Layout)."""