Crash in Inbox when question-requests dataSize is not loaded #21
Description
Description
Inbox.vue crashes during initial mount when request pagination
accesses getDataSize["question-requests"] before Firestore data
is fully loaded.
The request store assumes dataSize is always available, which
is not true on first render or slow connections.
This issue adds defensive guards around dataSize access to
prevent runtime errors and allow Inbox to render safely.
