fix(boards): the other two compile sites read the Arduino FQBN too

fqbnForLanguage landed on the single-board Run path and on
compileBoardForFlash, but compileAllBoards still read BOARD_KIND_FQBN
directly — so a canvas with more than one board, or any run that goes
through the multi-board path, still refused an ESP32-C5 kit with 'no FQBN
configured' while its ESP-IDF project built fine on its own.

frontend/src/components/editor/EditorToolbar.tsx

@@ -1073,7 +1073,7 @@ export const EditorToolbar = ({
         continue;
       }
 
-      const fqbn = BOARD_KIND_FQBN[board.boardKind];
+      const fqbn = fqbnForLanguage(board.boardKind, board.languageMode);
       if (!fqbn) {
         blog('error', 'no FQBN configured');
         boardFailed++;