Add structured JSON evidence export workflow

src/popup/popup.js

@@ -13,6 +13,12 @@ const evidenceLockedCount = document.getElementById("evidence-locked-count");
 const evidenceDashboardButton = document.getElementById(
   "evidence-dashboard-button"
 );
+const evidenceExportJsonButton = document.getElementById(
+  "evidence-export-json-button"
+);
+const evidenceExportJsonStatus = document.getElementById(
+  "evidence-export-json-status"
+);
 const evidenceRetentionStatus = document.getElementById(
   "evidence-retention-status"
 );
@@ -61,6 +67,8 @@ document.addEventListener("DOMContentLoaded", async () => {
       url: browser.runtime.getURL("src/dashboard/dashboard.html")
     });
   });
+
+  evidenceExportJsonButton.addEventListener("click", exportEvidenceJsonFile);
 });
 
 async function renderSettings() {
@@ -134,3 +142,70 @@ function formatStatusValue(value) {
 function renderEvidenceRetentionMessage(message) {
   evidenceRetentionStatus.textContent = message;
 }
+
+async function exportEvidenceJsonFile() {
+  evidenceExportJsonButton.disabled = true;
+  renderEvidenceExportJsonMessage("Export läuft…");
+
+  try {
+    const result = await browser.runtime.sendMessage({
+      type: "export_evidence_json"
+    });
+
+    if (!result?.success || !result.export) {
+      throw new Error(result?.error ?? "export_evidence_json_failed");
+    }
+
+    downloadJsonExport(result.export);
+    renderEvidenceExportJsonMessage(buildExportSuccessMessage(result.export));
+  } catch (error) {
+    renderEvidenceExportJsonMessage("Export fehlgeschlagen");
+    console.warn("VendorGet-IV evidence JSON export failed", error);
+  } finally {
+    evidenceExportJsonButton.disabled = false;
+  }
+}
+
+function downloadJsonExport(exportContainer) {
+  const json = JSON.stringify(exportContainer, null, 2);
+  const blob = new Blob([json], { type: "application/json" });
+  const url = URL.createObjectURL(blob);
+  const downloadLink = document.createElement("a");
+
+  downloadLink.href = url;
+  downloadLink.download = `vendorget-evidence-export-${formatExportTimestamp(
+    new Date()
+  )}.json`;
+  document.body.append(downloadLink);
+  downloadLink.click();
+  downloadLink.remove();
+
+  setTimeout(() => URL.revokeObjectURL(url), 0);
+}
+
+function buildExportSuccessMessage(exportContainer) {
+  const storeCount = exportContainer?.metadata?.stores?.length ?? 0;
+  const totalRecordCount =
+    exportContainer?.metadata?.summary?.totalRecordCount ?? 0;
+
+  return `Export gespeichert: ${storeCount} Stores, ${totalRecordCount} Records`;
+}
+
+function formatExportTimestamp(date) {
+  const year = date.getFullYear();
+  const month = padDatePart(date.getMonth() + 1);
+  const day = padDatePart(date.getDate());
+  const hours = padDatePart(date.getHours());
+  const minutes = padDatePart(date.getMinutes());
+  const seconds = padDatePart(date.getSeconds());
+
+  return `${year}${month}${day}-${hours}${minutes}${seconds}`;
+}
+
+function padDatePart(value) {
+  return String(value).padStart(2, "0");
+}
+
+function renderEvidenceExportJsonMessage(message) {
+  evidenceExportJsonStatus.textContent = message;
+}