Fix card-from-template created on the templates board (#5798)

When instantiating a card template, the new card was copied with tpl.boardId,
which for a template search is the *templates* board (the search source), not
the current board. The card still appeared in the target list (the list renders
cards by listId, and the templates board is subscribed), but it had
boardId = templates board, so clicking it navigated to the templates board
instead of opening the card detail.

Copy the template into the current board instead (the target list/swimlane were
already resolved on the current board), so the new card belongs to the board it
is placed on.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

client/components/lists/listBody.js

@@ -943,7 +943,16 @@ Template.searchElementPopup.events({
       if (tpl.isTemplateSearch) {
         element.type = 'cardType-card';
         element.linkedId = '';
-        _id = await element.copy(tpl.boardId, tpl.swimlaneId, tpl.listId);
+        // #5798: instantiate the template into the CURRENT board, not the
+        // templates board. For a template search tpl.boardId is the templates
+        // board (it is the search source), so copying with it created the card
+        // with boardId = templates board. The card still showed in the target
+        // list (the list query is by listId and the templates board is
+        // subscribed), but clicking it navigated to the templates board instead
+        // of opening the card. The target list/swimlane were already resolved on
+        // the current board.
+        const targetBoardId = (Utils.getCurrentBoard() || {})._id || tpl.boardId;
+        _id = await element.copy(targetBoardId, tpl.swimlaneId, tpl.listId);
         // 1.B Linked card
       } else {
         _id = element.link(tpl.boardId, tpl.swimlaneId, tpl.listId);