feat(radar): export radar data

frontend/src/lib/fn/csv.ts

@@ -0,0 +1,48 @@
+/**
+ * Converts a JSON array of objects to CSV format
+ * @param {Array} jsonData - Array of objects to convert
+ * @param {string} filename - Name of the file to download (without extension)
+ */
+export const convertJsonToCsv = (jsonData: Record<string, string | number | boolean>[]) => {
+  // Get headers from the first object
+
+  if (jsonData.length === 0) {
+    return new Blob([""], { type: "text/csv;charset=utf-8;" });
+  }
+
+  const headers = Object.keys(jsonData[0]);
+
+  const csvRows = [
+    headers.join(","),
+    // Add all data rows
+    ...jsonData.map((row) => {
+      return headers
+        .map((header) => {
+          // Handle special cases in the data
+          let cell = row[header];
+
+          // Convert null/undefined to empty string
+          if (cell === null || cell === undefined) {
+            return "";
+          }
+
+          // Handle normal values
+          if (typeof cell === "number" || typeof cell === "boolean") {
+            return cell;
+          }
+
+          // Convert objects/arrays to JSON string
+          if (typeof cell === "object") {
+            cell = JSON.stringify(cell);
+          }
+
+          // Escape quotes and wrap in quotes
+          cell = cell.toString().replace(/"/g, '""');
+          return `"${cell}"`;
+        })
+        .join(",");
+    })
+  ].join("\n");
+
+  return new Blob([csvRows], { type: "text/csv;charset=utf-8;" });
+};