feat(reports): add reports page and export notification downloads

src/api/notifications.ts

@@ -106,3 +106,67 @@ export const buildNotificationStreamUrl = (token: string) => {
   const cleanBaseUrl = API_BASE_URL.replace(/\/+$/, "")
   return `${cleanBaseUrl}/api/notifications/stream/?token=${encodeURIComponent(token)}`
 }
+
+const REPORT_EXPORT_DOWNLOAD_PATTERN = /\/api\/reports\/exports\/[^/]+\/download\/?$/
+
+const toApiEndpoint = (actionUrl: string) => {
+  const cleanBaseUrl = API_BASE_URL.replace(/\/+$/, "")
+  if (actionUrl.startsWith("http://") || actionUrl.startsWith("https://")) {
+    if (!actionUrl.startsWith(cleanBaseUrl)) {
+      return null
+    }
+    return actionUrl.slice(cleanBaseUrl.length) || "/"
+  }
+  return actionUrl.startsWith("/") ? actionUrl : `/${actionUrl}`
+}
+
+const getFilenameFromDisposition = (contentDisposition: string | null) => {
+  if (!contentDisposition) return null
+
+  const utfMatch = contentDisposition.match(/filename\*=UTF-8''([^;]+)/i)
+  if (utfMatch?.[1]) {
+    return decodeURIComponent(utfMatch[1])
+  }
+
+  const plainMatch = contentDisposition.match(/filename="?([^"]+)"?/i)
+  return plainMatch?.[1] || null
+}
+
+export const isReportExportDownloadUrl = (actionUrl?: string | null) => {
+  if (!actionUrl) return false
+  const endpoint = toApiEndpoint(actionUrl)
+  return !!endpoint && REPORT_EXPORT_DOWNLOAD_PATTERN.test(endpoint)
+}
+
+export const downloadNotificationFile = async (
+  actionUrl: string,
+  fallbackFilename?: string | null,
+) => {
+  const endpoint = toApiEndpoint(actionUrl)
+  if (!endpoint) {
+    throw new Error("Unsupported download url")
+  }
+
+  const response = await authFetch(endpoint, {
+    method: "GET",
+  })
+
+  if (!response.ok) {
+    throw new Error("Failed to download file")
+  }
+
+  const blob = await response.blob()
+  const objectUrl = window.URL.createObjectURL(blob)
+  const filename =
+    getFilenameFromDisposition(response.headers.get("content-disposition")) ||
+    fallbackFilename ||
+    "download"
+
+  const anchor = document.createElement("a")
+  anchor.href = objectUrl
+  anchor.download = filename
+  document.body.appendChild(anchor)
+  anchor.click()
+  anchor.remove()
+  window.URL.revokeObjectURL(objectUrl)
+}