Fix dashboard mobile load issues and simplify card layout.

Reduce poll pressure on phone/tablet, cache key prices, and handle live API errors gracefully. Rework mobile position and close cards with inline direction, compact P/L line, and detail modal.

Co-authored-by: Cursor <cursoragent@cursor.com>

app.py

@@ -1667,14 +1667,18 @@ def api_dashboard_live():
     from dashboard_lib import build_dashboard_payload
 
     _dashboard_sync_tick["n"] += 1
-    sync_trades = _dashboard_sync_tick["n"] % 5 == 0
-    payload = build_dashboard_payload(
-        get_db=get_db,
-        get_setting=get_setting,
-        fetch_price=fetch_price,
-        sync_ctp_trades=sync_trades,
-    )
-    return jsonify(payload)
+    sync_trades = _dashboard_sync_tick["n"] % 15 == 0
+    try:
+        payload = build_dashboard_payload(
+            get_db=get_db,
+            get_setting=get_setting,
+            fetch_price=fetch_price,
+            sync_ctp_trades=sync_trades,
+        )
+        return jsonify(payload)
+    except Exception as exc:
+        app.logger.exception("dashboard live: %s", exc)
+        return jsonify({"ok": False, "error": "看板数据暂时不可用"}), 503
 
 
 @app.route("/market")