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>

dashboard_lib.py

@@ -10,6 +10,25 @@ from typing import Any, Callable, Optional
 from zoneinfo import ZoneInfo
 
 _TZ = ZoneInfo("Asia/Shanghai")
+_PRICE_CACHE: dict[str, tuple[float, float]] = {}
+_PRICE_CACHE_TTL = 2.0
+
+
+def _cached_fetch_price(
+    fetch_price: Callable[[str, str, str], Optional[float]],
+    sym: str,
+    market: str,
+    sina: str,
+) -> Optional[float]:
+    key = sym or ""
+    now = datetime.now().timestamp()
+    hit = _PRICE_CACHE.get(key)
+    if hit and (now - hit[1]) < _PRICE_CACHE_TTL:
+        return hit[0]
+    price = fetch_price(sym, market, sina)
+    if price is not None:
+        _PRICE_CACHE[key] = (float(price), now)
+    return price
 
 
 def _direction_label(direction: str) -> str:
@@ -174,7 +193,7 @@ def build_dashboard_payload(
             sina = r["sina_code"] or ""
             upper = float(r["upper"] or 0)
             lower = float(r["lower"] or 0)
-            price = fetch_price(sym, market, sina)
+            price = _cached_fetch_price(fetch_price, sym, market, sina)
             dist_upper = dist_lower = None
             if price is not None:
                 dist_upper = round(upper - float(price), 2)