fix: ensure API calls always include required date parameter and improve status feedback

backend/app/services/mercado_publico.py

@@ -172,7 +172,8 @@ async def _fetch(params: Dict[str, str], retries: int = 3) -> List[Tender]:
 
 async def get_active_tenders() -> List[Tender]:
     """Fetch tenders active today."""
-    return await _fetch({})
+    today = datetime.now().strftime("%d%m%Y")
+    return await _fetch({"fecha": today})
 
 async def get_tenders_by_date(date_ddmmaaaa: str) -> List[Tender]:
     """Fetch tenders for a specific date (ddmmaaaa)."""

backend/app/services/mercado_publico_oc.py

@@ -126,8 +126,8 @@ async def get_oc_by_code(code: str) -> Optional[PurchaseOrder]:
 async def get_ocs_by_date(date: str, status: str = "todos") -> List[PurchaseOrder]:
     params = {"estado": status}
     today_str = datetime.now().strftime("%d%m%Y")
-    if date == today_str and status == "todos":
-        return await _fetch_oc({"estado": "todos"})
+    if date is None or (date == today_str and status == "todos"):
+        return await _fetch_oc({"fecha": today_str})
     
     params["fecha"] = date
     return await _fetch_oc(params)

frontend/components/Sidebar.tsx

@@ -110,7 +110,7 @@ export default function Sidebar({ tabs, activeTab, onTabSelect, status, lang, fo
               <div className="flex items-center gap-2">
                 <div className={`w-2 h-2 rounded-full ${status === "connected" ? "bg-green-500 animate-pulse" : "bg-yellow-500"}`} />
                 <span className={`text-xs font-medium ${status === "connected" ? "text-green-300" : "text-yellow-300"}`}>
-                  Systems Nominal
+                  {status === "connected" ? "Systems Nominal" : "Connection Warning"}
                 </span>
               </div>
             </>