fix(GRO-2652): reset authInitPromise on failure so retry loop actually retries

Merging Phase 1 fix — CI all green (lint, test, build all success). Resolves QA's retry-memoization concern from PR #223 review.

src/lib/auth.ts

@@ -329,5 +329,10 @@ export async function initAuth(): Promise<void> {
     });
   })();
 
-  await authInitPromise;
+  try {
+    await authInitPromise;
+  } catch (err) {
+    authInitPromise = null; // allow retry on next call
+    throw err;
+  }
 }