TestUnifiedSearch: Search for 'zzzznonexistent' instead of 'test' which
matches leftover test data from other tests. Fixes false 200 instead of 404.
TestWebSocketProgressBroadcast: Update to new progress endpoint
/api/media-items/:id/progress with correct PUT body format matching
ProgressService (percentage, epubcfi). Use book_id instead of
media_item_id to match WebSocket broadcast payload field names.
john-okeefe
7f66a62d45