Sync time entries with invoice lines and harden auth for mobile.

Link clocked time to invoice items with bidirectional sync, add entry editing on web, broaden session cookie detection for Expo clients, and handle API rate limits without signing users out.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/lib/object-storage.ts

@@ -73,9 +73,7 @@ async function withS3Diagnostics<T>(operation: () => Promise<T>): Promise<T> {
 }
 
 async function getS3() {
-  if (!s3ModulePromise) {
-    s3ModulePromise = import("@aws-sdk/client-s3");
-  }
+  s3ModulePromise ??= import("@aws-sdk/client-s3");
   const mod = await s3ModulePromise;
   if (!s3Client) {
     logBareMinioEndpointHint();