fix: kanban filters fixes (#26605)

* fix(kanban): don't concat old cards after filter

- this was messing up rendering filtered cards

* fix: refresh not working without standard fields

frappe/public/js/frappe/list/base_list.js

@@ -762,6 +762,10 @@ class FilterArea {
 		}
 		return frappe.run_serially(promises).then(() => {
 			this.trigger_refresh = true;
+			if (promises.length === 0) {
+				// refresh if there are no standard fields
+				this.debounced_refresh_list_view();
+			}
 		});
 	}
 

frappe/public/js/frappe/views/kanban/kanban_board.bundle.js

@@ -53,7 +53,6 @@ frappe.provide("frappe.views");
 				var state = context.state;
 				var _cards = cards
 					.map((card) => prepare_card(card, state))
-					.concat(state.cards)
 					.uniqBy((card) => card.name);
 
 				context.commit("update_state", {