feat: add onboarding with oldmarr import (#1606)

packages/old-import/src/prepare/prepare-boards.ts

@@ -0,0 +1,34 @@
+import { objectEntries } from "@homarr/common";
+import type { BoardSize } from "@homarr/old-schema";
+
+import type { ValidAnalyseConfig } from "../analyse/types";
+import type { BoardSelectionMap } from "../components/initial/board-selection-card";
+
+const boardSizeSuffix: Record<BoardSize, string> = {
+  lg: "large",
+  md: "medium",
+  sm: "small",
+};
+
+export const createBoardName = (fileName: string, boardSize: BoardSize) => {
+  return `${fileName.replace(".json", "")}-${boardSizeSuffix[boardSize]}`;
+};
+
+export const prepareBoards = (analyseConfigs: ValidAnalyseConfig[], selections: BoardSelectionMap) => {
+  return analyseConfigs.flatMap(({ name, config }) => {
+    const selectedSizes = selections.get(name);
+    if (!selectedSizes) return [];
+
+    return objectEntries(selectedSizes)
+      .map(([size, selected]) => {
+        if (!selected) return null;
+
+        return {
+          name: createBoardName(name, size),
+          size,
+          config,
+        };
+      })
+      .filter((board) => board !== null);
+  });
+};