fix(rgi): rgiDownload handles session expiry + re-login on 401/302/404

eTerra returns 404 (not 401) when session expires during file download
because it redirects to login page. Now rgiDownload:
- Uses validateStatus to catch all statuses
- Re-logins and retries on 401/302/404
- Sets Accept: */* header for binary downloads

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/modules/parcel-sync/services/eterra-client.ts

@@ -1015,17 +1015,34 @@ export class EterraClient {
    */
   async rgiDownload(path: string): Promise<{ data: Buffer; contentType: string; filename: string }> {
     const url = `${BASE_URL}/api/${path}`;
-    const response = await this.requestWithRetry(() =>
+    const doRequest = () =>
       this.client.get(url, {
         timeout: this.timeoutMs,
         responseType: "arraybuffer",
-      }),
+        // Override Accept header for binary download
-    );
+        headers: { Accept: "*/*" },
-    const cd = (response as { headers?: Record<string, string> }).headers?.["content-disposition"] ?? "";
+        // Don't throw on any status — we'll check manually
+        validateStatus: () => true,
+      });
+
+    let response = await doRequest();
+
+    // If 401/302/404 (session expired → redirect to login), re-login and retry
+    if (response.status === 401 || response.status === 302 || response.status === 404) {
+      await this.login(this.username, this.password);
+      response = await doRequest();
+    }
+
+    if (response.status !== 200) {
+      throw new Error(`Download failed: HTTP ${response.status}`);
+    }
+
+    const headers = response.headers as Record<string, string> | undefined;
+    const cd = headers?.["content-disposition"] ?? "";
     const match = /filename="?([^"]+)"?/.exec(cd);
     return {
       data: Buffer.from(response.data as ArrayBuffer),
-      contentType: (response as { headers?: Record<string, string> }).headers?.["content-type"] ?? "application/octet-stream",
+      contentType: headers?.["content-type"] ?? "application/octet-stream",
       filename: match?.[1] ?? "document.pdf",
     };
   }